Flat /raid/aavsonet/bsm_tx/200521/FlatB.fits Flat /raid/aavsonet/bsm_tx/200521/FlatC.fits Flat /raid/aavsonet/bsm_tx/200521/FlatI.fits Flat /raid/aavsonet/bsm_tx/200521/FlatR.fits Flat /raid/aavsonet/bsm_tx/200521/FlatV.fits