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ALFOSC Sequencer Command Documentation

Go to the SEQUENCER Reference Manual Main Page.

Instrument : ALFOSC
Observing Mode: ANY IMA SPEC POL
Command Type: ANY DATA DET DISP INST TEL
Usage: BASIC GENERAL STAFF
Description: SHORT LONG

SystemCommandArgumentsDescriptionType
alfosc abort [-d] Aborts an ongoing exposure (see also expose). DET
alfosc addtime [-d] <nn> Adds <nn> seconds to an ongoing exposure (note that <nn> can be negative too). DET
alfosc alfosc-calibs [-e] <date-string> Script to do biases and spectral calibs for all setups and windows used in a particular night.
Of course, this script should not be used for previous nights in case optical elements have been changed since.
The wheel setups are checked for inconsistencies in current vs stored wheel position content.
Any such inconsistent setup will be skipped, with a warning on the talker.

Command-line arguments:
[-e]                 echo mode: only show what will have be done in case started without the -e flag
<datestr>   for expample 'ALwb13'

Spectroscopic and window setups are collected from the FITSheader database.
For all different window setups bias frames will be taken.
For all different setups with a grism in the beam, spectroscopic flats and arc-lamp spectra will be taken.

For flat/arc exposure times, alfosc.callampstimes is used.
Setups that are yet non-supported by alfosc.callampstimes will automatically be skipped, with a warning on the talker

Is supposed to work also for spectropolarimetry.

DATA
alfosc allopen [-e] Will move all ALFOSC/FASU optical wheels to the OPEN position. Only wheels that according to the ALFOSC status are not already OPEN will be commanded to move. FASU wheels will always be commanded to move. INST
alfosc ampl [-d] <x> Sets the active amplifier to <x>, where <x> can be A, B, AB DET
alfosc aperture [-d] [id] [name] [pos] [ready] [step][orient] <n> Moves aperture wheel to slot number <n>. [id] returns the NOT ID of the element in the light path. [name] returns the name of the element in the light path. [pos] eturns the position [0-7] of the element in the light path. [ready] returns '0' if the element is moving, '1' if it is ready. [step] returns the step position [0-320000] of the element in the light path. [orient] returns the optical orientation of the element in the light path. INST
alfosc autoshow_off [-d] Turns off the automatic image display while reading out. If DS9 is running it will be terminated. DISP
alfosc autoshow_on [-d] Turns on the automatic image display while reading out. If no DS9 is running one will automatically be started. DISP
alfosc bin [-d] <n> Sets the binning factor in both X and Y directions to <n>. DET
alfosc calibexp [-e] [-f] [-n <nn>] [-o <ObjName>] [-lmi] <lampID> <tt> Script for making a calibration spectrum with ALFOSC. Possible arguments are:
  • -e      echo mode: do not execute commands, only echo them
  • -f      fast mode: script will return during the readout of the last exposure
  • -n <Nexp>   optional number of exposures (default=1)
  • -o <ObjectName>   optional ObjectName
  • -lmi   if set the mirror will stay in the beam at exit
  • <lampID>       with <lampID>=He/Ne/HeNe/ThAr/Halogen
  • <exptime>   exposure time
Sets the ALFOSC calibration items (mirror & lamps) up for a calibration spectrum, takes the calibration image(s) of which the last one in the background, switches off lamps, and per default takes calibration mirror out at exit. Switches autosave_on, and leaves it on. Moves FAPOL out if necesary. Sets header IMTYPE to FLAT/WAVE . If an <ObjectName> is given (double quoted if containing spaces), then the string will be added to the already present lamp specifier in the OBJECT FITS keyword. If CNTR-C is pressed the ongoing exposure will be aborted, and the calibration mirror will be moved out of the beam. NOTE: the last exposure will be taken in the background, so that instrument setup can be done during readout.
Usage example:
  alfosc.calibexp -n 2 Halogen 15   Makes 2 halogen flatfield images with individual exposure time of 15s.
DET
alfosc carriage [-d] [pos] [ready] [action] Moves FAPOL carriage in or out with the [action] keyword. [action] can be 'in', 'IN', 'out' or 'OUT'. [pos] returns '1' if the carriage is in the lightpath, '0' if it is out. [ready] returns '0' if the element is moving, '1' if it is ready. INST
alfosc cirpolexpose [-e] <Nang> <ObjName> <tt> <Ncyc> [-nowindow] Sets up and executes a set of circular polarimetry imaging exposures with <Nang> angles, exposure time <tt> and <Ncyc> cycles. If optional argument -nowindow is used, no windowing is applied. Available number of angles: 2 (0°, 90°) and 4 (0°, 90°, 180°, 270°). DET
alfosc cirpolspec [-e] <Nang> <ObjName> <tt> <Ncyc> Sets up and executes a set of circular polarimetry spectroscopy exposures with <Nang> angles, exposure time <tt> and <Ncyc> cycles. Available number of angles: 2 (0°, 90°) and 4 (0°, 90°, 180°, 270°). DET
alfosc clearobject [-d] Clears the value of the FITS keyword OBJECT. DATA
alfosc clearobserver [-d] Clears the value of the FITS keyword OBSERVER. DATA
alfosc comment [-d] <text> Sets the FITS keyword COMMENT to <text>. Will be cleared after each image. FEB 13, 2013: This command is currently unavailable. DATA
alfosc dark [-d] [-t] [-f] <tt> Makes a dark exposure of <tt> seconds. To abort the exposure press "Control-C". If the option [-f] (fast mode) is used, the prompt will be returned when the exposure time is over and before the readout begins. DET
alfosc display [<file>] Loads an image into the ALFOSC DS9 display. If no <file> is specified, the last image obtained will be loaded. If no DS9 display exists, one will be started. DISP
alfosc display-start Starts an empty ALFOSC DS9 display. DISP
alfosc dither [-e] [-t] [-nowakeup] <pattern> <offset_size> <tt> Takes single exposures at each pointing of a dither pattern. The pointings in a dither pattern are symmetrical around the initial pointing, except for the ABBA scripts, which starts with an exposure on initial pointing. It is possible to specify a negative offset size, in which case the offsets are performed in the opposite direction.
  • [-e]: Echo script on stdout, do not execute
  • [-t]: Simulate exposure only
  • [-nowakeup]: no astrowakeup at the end of script
  • <pattern> predefined dither pattern.
  • <offset_size> telescope offset in arcsec between each exposure.
  • <exptime> exposure time at each pointing.
The dither pattern can be one of the following listed below:
  • 2X : 2-point (X)
  • 3X : 3-point (X)
  • 5X : 5-point (X)
  • 2Y : 2-point (Y)
  • 3Y : 3-point (Y)
  • 5Y : 5-point (Y)
  • 5D : 5-point (dice 5)
  • 4G : 2x2 grid
  • 9G : 3x3 grid
  • 16G : 4x4 grid
  • ABBAX : A-B-B-A (X)
  • ABBAY : A-B-B-A (Y)
Usage example:
  alfosc.dither 3X 20 15   Makes a 3-point X dither pattern with a 15s exposure at each dither point and a 20" offset between each exposure.
DET
alfosc expose [-d] [-t] [-f] <tt> Makes an exposure of <tt> seconds. To abort the exposure press "Control-C". This command checks if ALFOSC, FASU and FAPOL are ready before beginning the exposure. If 90 seconds occurs and it is not ready this command will time out. If the option [-f] (fast mode) is used, the prompt will be returned when the exposure time is over and before the readout begins. If [-f] is used, make sure that "alfosc.wait-camera-state idle"-command is given before any "alfosc_camera_commands". If the exposure time is larger than 300 seconds, the time left until the rotator reaches its limit will be checked. If there is not time enough to complete the exposure, an error will be generated and the exposure will not start. DET
alfosc fasua [-d] [id] [name] [pos] [ready] <n> Moves FASU wheel A to position <n>. [id] returns the NOT ID of the element in the light path. [name] returns the name of the element in the light path. [pos] returns the position [0-6] of the element in the light path. [ready] returns '0' if the element is moving, '1' if it is ready. INST
alfosc fasub [-d] [id] [name] [pos] [ready] <n> Moves FASU wheel B to position <n>. [id] returns the NOT ID of the element in the light path. [name] returns the name of the element in the light path. [pos] returns the position [0-6] of the element in the light path. [ready] returns '0' if the element is moving, '1' if it is ready. INST
alfosc filename [-d] <nn> Sets the default file name to <nn> (four characters). DATA
alfosc filenamestd [-d] Sets the filename back to the default file name. DATA
alfosc filter [-d] [id] [name] [pos] [ready] [step][orient] <n> Moves filter wheel to position <n>. [id] returns the NOT ID of the element in the light path. [name] returns the name of the element in the light path. [pos] returns the position [0-6] of the element in the light path. [ready] returns '0' if the element is moving, '1' if it is ready. [step] returns the step position [0-320000] of the element in the light path. [orient] returns the optical orientation of the element in the light path. INST
alfosc focus [-e] [-n <N>] [-nodefault] [-t <nn>] [-a <mode>] Fully automated focus script for ALFOSC.
[-n <N>]: Number, <N>, of maximal loops, default is 3.
[-t <nn>] Expose <nn> seconds. Default is 10.
[-nodefault]: Start from actual focus rather than default focus.
[-a <mode>]: Acquisition mode. <mode> can be:
  • noacq: Use current pointing for focusing.
  • nearest: Use nearest focus field from current pointing.
  • optimal: Use nearest focus field between 60-70 degrees altitude (default)
Focus is determined without any filter in the beam. Filter and any other ALFOSC instrument & detector settings will be saved before running the focus script and restored at the end.
The 'focus' command is the recommended way of focusing the telescope. In case the command fails, for instance if too few stars are detected in the image, the focus can be determined in a more interactive mode by using the commands focuspyr-setup, expose, focuspyr, focus-position (see documentation on these commands for further information).

Usage example:
  alfosc.focus -n 4 -t 15 -a nearest   Focuses the telescope using the nearest focusfield, doing 4 loops with individual exposures of 15s.

TEL
alfosc focus-offset [-e] Optics in the beam introduces a telescope focus offset (see table). The 'focus-offset' command checks what is currently in the FASU and ALFOSC filter wheels and applies the corresponding focus offset (using foc-del) when possible. The focus offset introduced by a retarder plate in polarimetry mode is also accounted for. Be very careful when using this command. Focus offset for many optical elements are not known and as a consequence the telescope may in fact not be in focus even after using this command. If the focus offset is not known, 0 will be assumed. If this occurs, a warning message will appear both in the talker window and in the sequencer window. Several warning messages may appear if several optical elements in the beam have unknown focus offsets. The final telescope focus offset applied is the sum of the offsets for the element in each wheel, and may therefore be wrong if any offset is unknown. Do not use this command in scripts unless you are absolutely sure that the focus offset are known for all optical elements to be used. TEL
alfosc focuspyr Interactively examine a focus pyramid image to determine the focus offset required to bring the telescope in focus. The estimated best focus offset determined by the focuspyr-auto script will be presented on screen for comparison. DATA
alfosc focuspyr-auto [<file>] Computes the required telescope focus offset from a Focus Pyramid image <file>. If no input file is given (full path), the last image in the data directory will be used. DATA
alfosc focuspyr-setup [-e] [-filter] Script to setup ALFOSC for focussing.
  • moves the FocusPyramid in.
  • puts the aperture wheel to open position.
  • moves mirror and retarder out of the beam if they are in.
  • turns off all ALFOSC calibration lamps.
  • windows the read-out using alfosc.focuswindow.
  • by default puts all filter wheels (FASU A,B and ALFOSC) to open position.
  • if optional argument -filter is used, the filter wheels will be left as they are. NB: this mode will not touch the filter wheels even if there is filters in all 3 wheels!
INST
alfosc focuswindow [-e] Script to set the ALFOSC CCD to readout only a central 800x800 pixel unbinned window. DET
alfosc gainhi [-d] Sets the gain mode to high gain. DET
alfosc gainlo [-d] Sets the gain mode to low gain. DET
alfosc grism [-d] [id] [name] [pos] [ready] [step][orient] <n> Moves the grism wheel to position <n>. [id] returns the NOT ID of the element in the light path. [name] returns the name of the element in the light path. [pos] returns the position [0-6] of the element in the light path. [ready] returns '0' if the element is moving, '1' if it is ready. [step] returns the step position [0-320000] of the element in the light path. [orient] returns the optical orientation of the element in the light path. INST
alfosc hicut <value> Applies a minmax scaling to the loaded DS9 image and set the highcut to <value>. DISP
alfosc imexam Initiates an IRAF imexam session on the image currently loaded into the ALFOSC DS9. While active in the imexam session, no further commands can be issued from the sequencer window. To kill the imexam session type q on the image in the postprocessing display.

CURSOR KEY COMMANDS:

?       Print help
a       Aperture radial photometry measurement (see above for output)
c       Column plot
e       Contour plot
f       Redraw the last graph
j       Fit 1D gaussian to image lines
k       Fit 1D gaussian to image columns
l       Line plot
m       Statistics
            image[section] npixels mean median stddev min max
q       Quit
r       Radial profile plot (see above for output)
s       Surface plot
x       Print coordinates
            col line pixval [xorign yorigin dx dy r theta]
DATA
alfosc impath [-d] <text> Sets the path of the image saving to <text>. DATA
alfosc imtype [-d] <text> Sets the FITS keyword IMTYPE to <text>. DATA
alfosc killdisplay Terminates all instances of the ALFOSC DS9 display. DISP
alfosc killimexam Terminates all ALFOSC sequencer scripts related to imexam and the ALFOSC DS9 display. DISP
alfosc lamp [-d] [position] <n> <m> Turn on/off lamp no. <n>, where <n> is [1-4] and <m>='1' to turn on and <m>='0' to turn off. Current (29/10-2007) lamp setup: Lamp 1 is "He" Lamp 2 is "Ne" Lamp 3 is "Halogen" Lamp 4 is "ThAr Hollow Cathode". A timer will turn off any lamp after 1200 sec. Subsequent commands to turn on a lamp will result in the timer being reset to 1200 seconds. [position] returns a 4 bit pattern corresponding to the state of the 4 lamps: If bit no. 1 is set, lamp no. 1 is on, else off If bit no. 2 is set, lamp no. 2 is on, else off If bit no. 3 is set, lamp no. 3 is on, else off If bit no. 4 is set, lamp no. 4 is on, else off INST
alfosc linpolexpose [-e] <Nang> <ObjName> <tt> <Ncyc> [-nowindow] Checks if polarizer and Calcite are in and moves them in if necessary and does cycles of exposures. The object name is set to <myobject> and the current polarizer angle is added (e.g. "<myobject> 0deg"), object name is cleared when script ends. By default, the script windows the read-out using alfosc.polwin, with option -nowindow, no windowing is applied! Available number of angles: 4 (0°, 22.5°, 45°, and 67.5°) 8 (0° to 157.5° in steps of 22.5°) 16 (0° to 337.5° in steps of 22.5°) DET
alfosc linpolspec [-e] <Nang> <ObjName> <tt> <Ncyc> Checks if polarizer and polarimetry slitlet are in and moves them in if necessary and does cycles of exposures. The object name is set to <myobject> and the current polarizer angle is added (e.g. "<myobject> 0deg"), object name is cleared when script ends. Does NOT window the read-out! Available number of angles: 4 (0°, 22.5°, 45°, and 67.5°) 8 (0° to 157.5° in steps of 22.5°) 16 (0° to 337.5° in steps of 22.5°) DET
alfosc locut <value> Applies a minmax scaling to the loaded DS9 image and set the lowcut to <value>. DISP
alfosc log-comment "Comment in quotes" [file1 file2 ...] When invoked with just the comment, it will be applied to the latest available image with a prefix for the current night (which starts at noon) and the sequencer's instrument.

If image names are provided, the program will test the existence of ALL them before applying the change.

Eg.

        $ alfosc.log-comment "This is a comment"
        $ alfosc.log-comment "Comment for two" ALug170154 ALug170155
Notice that there's no need to add the ".fits" after each image's name

If no arguments are provided, a usage message is displayed

DATA
alfosc mdark [-t] <tt> <nn> Makes <nn> dark exposure of <tt> seconds. To abort the exposures press "Control-C". The image type (IMTYPE keyword) will be set to "DARK" if the exposure time is non-zero and "BIAS" if it is zero. DET
alfosc mexpose [-t] <tt> <nn> [<imtype>] Makes <nn> exposures of <tt> seconds. To abort the exposures press "Control-C". The <imtype> option (IMTYPE keyword) is optional and must be a text string without spaces. There are reported problems with this command that have not yet been solved. If you experience this, please use the alternative command single-mexpose. If the exposure time is larger than 300 seconds, the time left until the rotator reaches its limit will be checked. If there is not time enough to complete the exposure, an error will be generated and the exposure will not start. DET
alfosc mirror [-d] [pos] [ready] <n> Moves calibration mirror in or out, <n>=1 for in and <n>=0 for out. [pos] returns the position of the calibration mirror. '1' is in, '0' is out. [ready] returns '0' if the element is moving, '1' if it is ready. INST
alfosc object [-d] <text> Sets the FITS keyword OBJECT to <text>. DATA
alfosc observer [-d] <text> Sets the FITS keyword OBSERVER to <text>. DATA
alfosc optics [-e] [-s <slit>] [-g <grism>] [-f <filterID>] [-d <wheel>] [-m] [-a] [-p] [-o] [-h] Searches ALFOSC and FASU wheels for optical elements. Returns the wheel (fi, fa, fb, ap, gr), the position (integer number) and the optical element. Optional output (with flag -a) returns also the alignment tag (Y/N). Optional output (with flag -p) returns the slit position (x and y). This script can also be used to turn the corresponding wheel(s) to searched position(s) with optional flag -m. Note that this moves only the corresponding wheels, leaving other wheels as they were. Flag options:
  • -g <grism>
    Searches the grism and the filter wheel with given <grism> e.g. "#4"
  • -s <sslit>
    Searches the aperture wheel with given <slit> e.g. 0.75
  • -f <filterID>
    Searches the filter, FASUa and FASUb wheels with filter <filterID> e.g. 76
  • -m
    Turns the wheel(s) so that the searched optical element(s) is in the light beam
  • -d <wheel>
    Displays the content of the wheel, <wheel> is the name of the wheel: filter/fasua/fasub/grism/slit (Cannot be used with flags -s/-g/-f)
  • -a
    Prints out the alignment tag (Y/N) in the output
  • -p
    Prints out the the slit position (x, y) in the output
  • -o
    Prints out the 'Open' positions for every wheel. (Cannot be used with flags -s/-g/-f)
  • -h
    Prints out help
Usage example:
  alfosc.optics -f 76 -g "#4" -s 0.75 -a -p
Returns:
  fi 4 "R_Bes 650_130"
  gr 1 Y "Grism_#4"
  ap 0 Y 1050 1008.79 "Slit_0.75""
INST
alfosc overlay [yes|no] Overlays the loaded DS9 image with seeing information and marks saturated objects. DISP
alfosc polarizer [-d] [pos] [ready] <n> Moves the polarizer to angle <n>, where <n> is any multiple of 22.5 between '0' and '337.5'. [pos] returns the current polarizer position. [ready] returns '0' if the element is moving, '1' if it is ready. INST
alfosc polwin Windows the readout, optimized for imaging polarimetry. DET
alfosc qicpol [<2ndfile>] Circular polarimetry quick-look tool (FAPOL+ calcite) which calculates the circular polarization from a set of two images (retarder plate positions 0 and 90.0 degrees). The flux of each image is measured with fixed aperture using iraf/apphot from raw images. See more detailed description of the script from here DATA
alfosc qilpol [<4thfile>] Linear polarimetry quick-look tool (FAPOL+ calcite) which calculates the linear polarization from a set of four images (retarder plate positions 0, 22.5 45 and 67.5 degrees). The flux of each image is measured with fixed aperture using iraf/apphot from raw images. See more detailed description of the script from here. DATA
alfosc readout [-d] Closes the shutter and reads out the ccd. You have to put the exposure in the background first. This is achieved by pressing Ctrl+Z in the sequencer where the expose command is running, followed by running the command bg. Note that this command does not work correctly when using a window in Y direction: data from a wrong window will be saved to file. DET
alfosc readspeed [-d] <readout_speed> Sets the CCD readout speed to <readout_speed> kpix/second. Valid values for <readout_speed> are 100, 200, 400 or 800. DET
alfosc rempath [-d] <nn> Sets the remote saving path to <nn>. DATA
alfosc remsave_off [-d] Turns off remote saving. DATA
alfosc remsave_on [-d] Turns on remote saving. DATA
alfosc remsystem [-d] <nn> Sets the remote host computer to <nn>. DATA
alfosc reset-log The script will use infosys.kill to reset the monitoring system, then it will wait for a set number of seconds, and at last it will instruct the obslog to show the listing for alfosc, all the while informing the user about what is happening

If there's any error, the script will notify the user and suggest further actions.
DATA
alfosc resetxy [-d] Resets the ccd binning to 1, the X and Y size to maximum and the X and Y beginning to 1. DET
alfosc restore-uparm Populates the iraf uparm directory, used by the pyraf based sequencer scripts, with some known working parameter files. DATA
alfosc save [-d] Saves a read-out image to disk. DATA
alfosc setdisplay [<Xserver>] Set the X server on which the DS9 window will be displayed. If no <X server> is specified, the server from which the command is issued will be used. Note that the X server must allow for remote connections (use 'xhost'). DISP
alfosc single-mdark [-t] <tt> <nn> Makes <nn> dark exposures of <tt> seconds. To abort the exposures press "Control-C". The image type (IMTYPE keyword) will be set to "DARK" if the exposure time is non-zero and "BIAS" if it is zero. DET
alfosc single-mexpose [-t] <tt> <nn> [<imtype>] Makes <nn> exposures of <tt> seconds. To abort the exposures press "Control-C". The <imtype> option (IMTYPE keyword) is optional and must be a text string without spaces. This command is an alternative to mexpose that can lead to errors. DET
alfosc snapshot [store|restore] Snapshot facility for ALFOSC. Uses the store and restore commands on the systems ALFOSC,FASU & CCD8. This command is useful to conveniently save the current state of the instrument and detector for later restoring, for instance after executing scripts that alter the setup. Note that this will only work as expected as long as the wheel contents are not changed! INST
alfosc teloffset <n> <m> Offsets an object on the CCD <n> arcseconds in X direction, <m> arcseconds in Y direction. TEL
alfosc wait-camera-state [idle|integrating|readout|not-integrating] The sequencer prompt will not be returned until the state of the ALFOSC camera matches the state given as an argument. This is useful in scripts, for instance to execute commands when the camera is reading out. For multiple exposures, the command will wait until the state of the last exposure is matched. Caution: Do not use this command to catch camera states that is expected to last only a short time (less than around 1 second). The state change may not be detected by the command, and the sequencer prompt may never be returned. Please note that waiting for the state to be 'readout' before an exposure is started will result in the command waiting forever. INST
alfosc wait_alfosc_ready [-d] Waits until all the following items are ready (not moving): FASU A and B, aperture, filter, grism, ALFOSC focus, FAPOL carriage and FAPOL polarizer. INST
alfosc wcs-align [yes|no] Display the loaded image using world coordinates such that North is up. Called with the [no] option, the image is aligned according to orientation on the detector. DISP
alfosc wheels [-e] [-s <slit>] [-g <grism>] [-c <crossdisp>] [-f <filter>] [-nowait] [-forceFASU] Script to setup all 5 ALFOSC wheels, in quickest possible way. Possible arguments are:
  • -s <slit>   aperture-wheel item string
  • -g <grism>   grism string
  • -c <crossdisperser>   crossdisp grism string
  • -f <filterID>   filter number
  • -nowait   exit while wheels are moving
  • -forceFASU   force the FASU wheels to move even when at required position
Each wheel defaults to the OPEN position, unless it needs to be put to a different position as requested through the command-line arguments. Consequently, without any arguments alfosc.wheels puts all wheels to open. The script uses alfosc.optics to check the feasibility of the requested setup. If feasible, the wheels will be moved to put the requested items in the beam. If wheels are already in the correct position they will not be exercised, except for the FASU wheels when flag -forceFASU is given. If a requested setup is not possible, an error will result, and no wheels will be moved. Note: grism/slit strings should be unique. A list of optical items can be found here. Note: filter ID numbers can be found here. Note: the Focus_Pyr is considered a grism!! Note: for spectroscopy the horizontal/vertical requirements for the optical elements are tested.
Usage examples:
  • alfosc.wheels -f 74   sets up for imaging with filter #74
  • alfosc.wheels -g Focus_Pyr   sets up for focusing without filters
  • alfosc.wheels -s Slit_1.0 -g "#4"   sets up for spectroscopy with slit 1.0" and Gr#4
  • alfosc.wheels -s Slit_1.0 -g "#4" -f 93   sets up for spectroscopy with slit 1.0" and Gr#4 and blocking filter #93
  • alfosc.wheels -s Ech_0.8 -g "#9" -c "#10"   sets up for Echelle spectroscopy with slit 0.8" and Echelle Gr#9 and cross disperser Gr#10
INST
alfosc xbeg [-d] <nn> Sets the X beginning to <nn>. DET
alfosc xbin [-d] <n> Sets the binning factor in the X direction to <n>. DET
alfosc xsize [-d] <nn> Sets the X size to <nn>. DET
alfosc ybeg [-d] <nn> Sets the Y beginning to <nn>. DET
alfosc ybin [-d] <nn> Sets the binning factor in the Y direction to <n>. DET
alfosc ysize [-d] <nn> Sets the Y size to <nn>. DET
alfosc zscale Sets the upper and lower limits of the loaded image based on the IRAF ZScale algorithm. (Displays the image values near the median image value). DISP

In scripts, the syntax alfosc.<command> should be used.
If a part of a command is written in <angle brackets>, this is an argument that should be replaced with a value.
If a part of a command is written in [square brackets], this is an optional argument or flag.
When available, the optional flag -d will write extended debugging information to the log.
When available, the optional flag -e will show the script on standard output instead of executing the commands.
When available, the optional flag -t will only make a simulated exposure. Useful for testing scripts.

Type definitions:
DATA: All commands related to handling/modifying data (editing fits-headers, post-processing etc.).
DET: Commands related to operations with the detector.
DISP: Commands related to displaying images on the instrument computer.
INST: Commands related to operations with the instrument.
TEL: Commands related to operations with the telescope.

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