FOCAS Spectroscopic Data Reduction Quick Guide

*.pro: IDL program

*.cl: IRAF CL script

First step: Distortion calibration, Grism alignment correction + Bias subtraction, Flat fielding

FSPECRED.pro

Second: Wavelength calibration

fwavecalib.cl (with CAL), or fwavecalib_sky.cl (with OH sky lines, without CAL)

Using IRAF identify, reidentify, fitcoord, transform tasks

Third step: Sky subtraction

fskysub.cl

Using IRAF background task

Fourth step: Standard star data reduction

Do steps 1-3 for Standard star spectra

Fifth step: Sensitivity calibration using standard star + Atmospheric absorption correction

fsenscalib.cl

Using IRAF standard, sensfunc, senscalib, extinction tasks