Sbiasflat

Sbiasflat makes bias and flat-field corrections to all 8 ccd frames of a spectral mage set. Depending on input, biasflat does one of several things:
The following input options may be used:

Sbiasflat returns a new set of image files framename_b_cn.fits, for bias corrected frames, and framename_f_cn.fits for bias and flat corrected frames. Sbiasflat is intended for spectroscopic images.  Flat-fielding of direct images should be done using biasflat.

USAGE
Sbiasflat [-b biasframe] [-f flatframe] [-m mapfile] [framename]
INPUT
biasframe is the name of a bias frame set
flatframe is the name of a flat frame set
framename isa set of image files to be corrected
OUTPUT
framename_b_cn.fits  or framename_f_cn.fits are sets of corrected frames
PARAMETERS
gain1
relative gain (e-/adu) of chip 1
...
...
gain8
relative gain (e-/adu) of chip 8




Details:

Like biasflat, Sbiasflat does bias and flatfiield corrections over the entire frame. However, Sbiasflat uses a spectral map to remove the wavelength dependance of the flat field lamp in each spectrum, so that
the spectral shape is not distorted by the calibration lamp spectral energy distribution. Sbiasflat handles nod & shuffle data in the following manner:


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