LISTCAL -- A CLASS Macro for Summarizing Calibration Scans

    LISTCAL will search a CLASS file and find the calibration scans.  It 
lists the scan number, a T or a C to indicate which were Cold Cal's, the 
date, azimuth, and elevation.  For each spectrometer, it also lists the 
Trec, the zenith Tsys, the zenith opacity, and the frequency.  The calibration
scan header doesn't record the Trec, Tsys, or Tau since that calculation is
done after the data has been written.  So the macro looks for the observation
that follows the Cal to fetch these quantities.  If the following observation
was another Cal, the Tsys value is not available, as it will have been reset 
to 1.0 in preparation for the Cal.  In that case, the macro puts ---- in the
Tsys field.  If no observation follows the Cal, the Trec and Tau will also be
----.

    To use the macro, first do a FILE IN command then

	@ FDATA:[OBS]LISTCAL [<first scan> <last scan>]

or, if using Jever,

	@ "/net/frankenheim/dka100/obs/listcal" [<first scan> <last scan>]

The <first scan> and <last scan> numbers are optional.

If three AOS's or the filterbanks were used, the output may be longer than 
80 columns.  To prevent the lines from being wrapped, you must START class
in a window at least 100 columns wide.  In the Unix version, you must also set
an environment variable BEFORE you start class:

	setenv COLUMNS 100

(or greater).