The INSTWYF packet lists the header items which define the state of the WYFFOS Spectrograph. The header records should be as follows:
CENWAVE = / Approx. central wavelength (Angstroms) LINESMM = / No. of grating rulings per mm DISPERSI= / Nominal dispersion (Angstroms/mm) WYFCONF = / WYFFOS Configuration (Reflection or Transmission) WYFFEED = / Fibre Feed Identification WYFFILTA= / Filter A name WYFFILTB= / Filter B name WYFFOCUS= / Slit focus setting (microns) WYFSTRAN= / Slit translation setting (microns) WYFHART = / State of Hartmann shutters WYFGRAT = / Name of grating WYFTHETA= / Angle of grating (millidegrees) WYFLAMPS= / WYFFOS Comparison Lamps WYFTEMP = / WYFFOS Temperature at approx. start of exposure (deg C) WYFHUM = / WYFFOS Relative Humidity at approx. start of exposure (% RH)