CCD Window Files, (for sausage- and crepe-cube scans):
tek_dhj-1: 5x5 pix window binned from central 100x100 region of chip (often saturates on lamps because of binning), tek_ttf_on_off: samples on/off optical axis, thom_ttf_on_off: samples on/off optical axis, tek_ttf_on_slit: is middle of field on slit and edge.