StanCam colour term
The transformation equations are in the form:
Bb=zp+ct*(BV)k*Xk'*X*(BV)
Where B is the catalogue magnitude, b instrumental magnitude,
zp magnitude zero point, ct colour term,
(BV) colour index,
k extinction, X airmass and k' 2ndorder extinction.
Band 
Colour index 
Colour term 
Error 
Second order extinction 
U 
UB 
0.0869 
0.0099 
0.03 
B 
BV 
0.0023 
0.0009 
0.03 
V 
BV 
0.0636 
0.0012 
0.0 
R 
VR 
0.1149 
0.0026 
0.0 
I 
VI 
0.0586 
0.0057 
0.0 
V 
VR 
0.1147 
0.0021 
0.0 
R 
RI 
0.1108 
0.0025 
0.0 
I 
RI 
0.1175 
0.0114 
0.0 
Note that for U and B bands secondorder extinction of
0.03 was always assumed.
This was computed with synthetic photometry.
U,B and I colourterms were
computed with much less observations than V and R. The colourterms are very
similar to ALFOSC, except maybe V and I.
These results were kindly provided by Vallery Stanishev.
