Flat /raid/aavsonet/bsm_tx/200719/FlatB.fits
Flat /raid/aavsonet/bsm_tx/200719/FlatC.fits
Flat /raid/aavsonet/bsm_tx/200719/FlatI.fits
Flat /raid/aavsonet/bsm_tx/200719/FlatR.fits
Flat /raid/aavsonet/bsm_tx/200719/FlatV.fits