Making frames showing fluxes per unit exposure time

All object and standard frames, after subtraction of the sky background, must be corrected to have fluxes per unit exposure time before applying the wavelength sensitivity calibration. For this purpose, the frames taken with IRCS have to be divided by $IT \times NDR \times COADD$, where $IT$ is the integration time for each frame, $NDR$ is the number of non-destructive read-out, and $COADD$ is the number of co-adding. These three parameters are shown in the FITS header of each frame as EXP1TIME, NDR, and COADDS, respectively.