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[WEEDS\]MODSOURCE MODFILE ANTSIZE [/TCONT TCONT] [/OPACITY I]
Model the emission of a source assuming local thermodynamic equilibrium
(LTE). The model paramaters (column density, kinetic temperature, source
size, line width and velocity offset for each species) are read from
MODFILE. The modeled brightness temperature is stored in the TB_MODEL
memory. For convenience the current spectrum is also stored in a memory,
OBS, so one can easily overplot the result of the model on the observed
spectrum. See the documentation manual for more details on the computa-
MODFILE the name of the file containing the parameters. The file
must have one line per species with at least six columns
1) The species name
2) The column density for this species in cm-2
3) The excitation temperature in K
4) The source size in arcsec
5) The offset velocity from the source VLSR, in km/s
6) The line FWHM in km/s
One additional column may be used to select a different
origin for each species:
7) The origin of this species (e.g. JPL or CDMS). If emp-
ty, species with any origin are selected.
The following options may be used at the end of the line:
/ABSORPTION If this option is set, the component is as-
sumed to be a foreground layer.
/PARTFUNC Q Set the log10 of the partition function at
the excitation temperature to Q. If not set, the partition
function values (log-log interpolated/extrapolated at the
excitation temperature) from the selected database are
Lines that start with a "!" are treated as comments.
ANTSIZE the antenna size in meters
/TCONT set the continuum level to TCONT, in K. The value can be
scalar (one value for the whole frequency range) or an ar-
ray name (same size as RY, one value per channel). Default
/OPACITY I store the opacity of the Ith component in the TAU_MODEL
memory. Components are numbered in the same order as in
MODFILE, starting from 1.
/KEEPCONT do not remove the continuum from the final spectra.
/VERBOSE print partition function, line frequencies, upper level
energies and degeneracies, Einstein coefficients and opac-
ities at the line centers.