The following polynomials approximate to the LUTs used in the semester
1998B pipeline reduction and convert the bias-corrected CCD data onto
the CCD#1 system:
August 1998
CCD#2 true = 0.987086*value - 1.06221E-06*value**2 + 5.19301E-13*value**3
CCD#3 true = 0.993867*value + 4.15398E-07*value**2 - 1.02134E-12*value**3
CCD#4 true = 0.987744*value - 1.15224E-06*value**2 + 2.58758E-12*value**3
September 1998
CCD#2 true = 1.000010*value - 1.75546E-06*value**2 + 1.13966E-11*value**3
CCD#3 true = 0.998063*value + 2.51351E-07*value**2 - 8.71941E-13*value**3
CCD#4 true = 0.994517*value - 1.49265E-06*value**2 + 8.10674E-12*value**3
October 1998
CCD#2 true = 0.991703*value - 1.40928E-06*value**2 + 5.84305E-12*value**3
CCD#3 true = 0.993855*value + 5.36676E-07*value**2 - 5.50707E-12*value**3
CCD#4 true = 0.995565*value - 1.10012E-06*value**2 + 5.77076E-12*value**3
November 1998,
December 1998
Non-linearity is identical, within the errors of measuring it, to that of
October.
-ve values relative to bias level are left the same.
Alternatively if you want the LUTs: ftp to ftp.ast.cam.ac.uk; logon
as anomyous; cd apm/wfc; ascii; mget * ....................