The most important header parameters are defined by default as SIC variables in a protected mode. The others, of less frequent use, can be accessed if required by the user (see ``Advanced Processing''). The default variables are (RW means Read-Write variable, RO, Read-Only).
TELESCOPE Character*12, RW, Telescope name
NUMBER Integer, RW, Observation number
VERSION Integer, RO, Version number
DATATYPE Integer, RO, Type of observation
0 Line, 1 Continuum, 2 Skydip
QUALITY Integer, RO, Quality of data
SCAN Integer, RO, Original scan number
UTOBS Double, RO, UT of observation (Radians)
LSTOBS Double, RO, LST of observation (Radians)
AZIMUTH Real, RW, Azimuth of observation (Radians)
ELEVATION Real, RW, Elevation of observation (Radians)
TSYS Real, RW, System temperature
TIME Real, RW, Integration time (Seconds)
SOURCE Character*12, RW, Source name
LAMBDA Double, RW, Longitude of source (Radians)
BETA Double, RW, Latitude of source (Radians)
OFF_LAMBDA Double, RW, Offset in longitude (Radians)
OFF_BETA Double, RW, Offset in latitude (Radians)
EPOCH Real, RW, Epoch of coordinates (Years)
LINE Character*12 RW, Line name
CHANNELS Integer, RO, Number of channels
REFERENCE Real, RW, Reference channel
FREQ_STEP Real, RW, Frequency step by channel (MHz)
VELO_STEP Real, RW, Velocity step by channel (km/s)
VELOCITY Real, RW, Velocity of reference channel
FREQUENCY Double, RW, Rest frequency at reference channel
IMAGE Double, RW, Image frequency " " " "
BEAM_EFF Real, RW, Telescope beam efficiency
FORWARD_EFF Real, RW, Telescope forward efficiency
GAIN_IMAGE Real, RW, Image to signal band ratio
WATER Real, RO, Water vapor content (mm)
PRESSURE Real, RO, External pressure (hPa)
AMBIENT_T Real, RO, External temperature (K)
CHOPPER_T Real, RO, Chopper temperature (K)
COLD_T Real, RO, Cold load temperature (K)
TAU_SIGNAL Real, RO, Opacity in signal band
TAU_IMAGE Real, RO, Opacity in image band
ATM_SIGNAL Real, RO, Atmospheric temperature
in signal band
ATM_IMAGE Real, RO, Atmospheric temperature
in image band
RX Real[8192] RO, X values of data points
RY Real[8192] RW, Y values of data points
8192 is currently the maximum size of the spectra, but the variables RX and
RY are redimensioned to the effective number of channels for each spectrum.