Non-linearity Correction

Detector non-linearity corrections are applied to Classic Cam, IRCAM, and INGRID. For IRCAM the correction is $3.3\times10^{-6}$ times the square of the bias-subtracted signal. For INGRID the measured-to-actual counts is given by the expression 1.0 - 1.2247 x 10^-6 * M - 7.68045 x 10^-11 * M², where M is the measured ADU count, although it is actually applied after the pre-exposure readout is subtracted from the post-exposure integration. For Classic Cam the correction is 1.625$\times10^{-6}$ * (1 + overhead/exposure_time), where the overhead is 2 * speed * number of pre-exposure reads + (speed + readout time ) * number of post-exposure reads. The various parameters in this expression are either read from the headers or taken verbatim from an IRAF script cited in the user manual.
[CLASSICCAM/_CORRECT_NONLINEARITY_,
IRCAM/_CORRECT_NONLINEARITY_,
INGRID/_CORRECT_NONLINEARITY_PRE_POST_]