BADPIX masks for EFOSC2
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Description

This page contains BADPIX masks for EFOSC2.

NOTE: A detailed reporton the creation of the BADPIX masks can be found here.

NOTE: There also exists an older report on badpixels and cosmetics of EFOSC2.
The following is a summary of the processes and the resulting BADPIX masks for EFOSC2.

Program

I have written a PERL script ( mkBADPIX.pl ) which takes the raw data and outputs the tarred, gzipped badpixel files to go on the web.

Creation -- What mkBADPIX.pl does

The BADPIX masks for EFOSC2 are created in the following way:

Take: 5 Bias images, 5 Domeflats with low counts (~5000 counts), 5 Domeflats with high counts (~20,000 counts)
Zerocombine the Bias images
Bias subtract the Domeflat images
Flatcombine the domeflats with high counts - FLATHIGH
Flatcombine the domeflats with low counts - FLATLOW
imarith FLATLOW.fits / FLATHIGH.fits FLATLHRATIO.fits
ccdmask FLATLHRATIO.fits BADPIX.pl with the following parameters set:

                    Image Reduction and Analysis Facility
PACKAGE = ccdred
   TASK = ccdmask

image   =                       Input image
mask    =                       Output pixel mask
(ncmed  =                    7) Column box size for median level calculation
(nlmed  =                    7) Line box size for median level calculation
(ncsig  =                   15) Column box size for sigma calculation
(nlsig  =                   15) Line box size for sigma calculation
(lsigma =                  20.) Low clipping sigma
(hsigma =                  20.) High clipping sigma
(ngood  =                    5) Minimum column length of good pixel seqments
(linterp=                    2) Mask value for line interpolation 
(cinterp=                    3) Mask value for column interpolation 
(eqinter=                    2) Mask value for equal interpolation
(mode   =                   ql)

BADPIX masks

Data taken June 21 2003.

How to use the BADPIX masks