FLATFILE= '/data/gcam/58196/gimg-0004.fits.gz'                                  
FLATFILE= '/data/gcam/58196/gimg-0249.fits.gz'                                  
FLATFILE= '/data/gcam/58196/gimg-0350.fits.gz'                                  
FLATFILE= '/data/gcam/58196/gimg-0576.fits.gz'