***Observing Log*** SIMPLE = T / Proper FITS format used BITPIX = 16 / 2 byte-pixel per data point NAXIS = 2 / CCD array NAXIS1 = / Fastest varying axis in array NAXIS2 = / Next axis CCDSEG = ' ' / Frame format FILE = 'scbt04.fts' / File name OBJECT = 'bias ' / Image name IMAGETYP= 'zero ' / Type of observation OBSERVER= ' ' / Name(s) or ID(s) DATE-OBS= '31/03/99' / Universal Date: DD/MM/YY TIME-OBS= '20:32:26' / start Universal time ENDTIME = '20:32:26' / End time of exposure RA = ' ' / Right Ascension, hh:mm:ss DEC = ' ' / Declination, +/-dd:mm:ss HA = ' ' / Actual position of telescope EQUINOX = / Equinox EXPTIME = 0 / Exposure time in seconds EXPCOUNT= / Exposure meter counts AIRMASS = / Airmass at start of exposure CENTLAM = 5894 / Central wavelength for observation GRATING = 1800/51.58 / Grating description, lines/mm GTILT = / Grating Tilt, degrees XGRATING= / Cross Grating, lines/mm XGTILT = / Cross Grating Tilt, degrees FOCUSTEL= / telescope focus FOCUSSP = / spectrograph focus SLITWID = / slit width in microns SLITLEN = / slit length in microns COMMENT average of 4 biases COMMENT Dome T +7.6 C rel H 40% at 05:14 UT,ccdtemp -100.4C, 250u slit COMMENT exp meter 1320 Volts, Focus=6.85,first order; INSTRUME= 'cass-ccd' / Data acquisition instrument DETECTOR= 'DDOCCD ' / CSF-THX-31156 Thomson 1024x1024 ccd ORIGSEC = '[1:1024,1:1024]' / Original frame format TELESCOP= '1.88M ' / Telescope CREATOR = 'CCD5NT v6.0' / Program that created this FITS file FILTER = ' ' / Filter ID GAIN = 90 / cgain; =[(Gain_Factor-1)]x30 RELHUMID= / % relative humidity TEMP-DOM= / temperature: deg C, Dome floor air TEMP-CSE= / temperature: deg C, pri cast TEMP-SEC= / temperature: deg C, sec air TEMP-PRI= / temperature: deg C, pri air TEMP-CON= 19.0 / temperature: deg C, CE200 box TEMP-HRK= 16.1 / temperature: deg C, heated Rack TEMP-CS1= 13.2 / temperature: deg C, Cass: CCD-Bridge TEMP-CS2= 12.4 / temperature: deg C, Cass, position2 TEMP-EC1= / temperature: deg C, Eche, position1 TEMP-EC2= / temperature: deg C, Eche, position2 TEMP-TUB= / temperature: deg C, telescope tube TEMP-CEL= / temperature: deg C, mirror cell Ï