A sample DISH session
---------------------

% . /home/aips++/stable/aipsinit.sh
% dish

# In GB, the above two commands can be replaced by typing "gbdish" at the
# unix prompt on any linux system

# Load from raw GBT FITS files and list the scan numbers

d.import('/home/gbtdata/OHsurvey','oh_data',,17,20)
d.lscans()
d.gms()

# define a glish array containing the scan numbers and calibrate them

onscans := [18,20]
d.calib(onscans)

# inspect the calibrated data

d.plotc(18)
d.plotc(20)

# average the scans

d.accum(onscans)
d.ave()
d.show()
d.avgFeeds()
d.show()

# fit a baseline

d.setregion()
d.nfit(3)
d.bshape()
d.baseline()
d.show()

# do some smoothing and fit a gaussian

# d.hanning()
d.show()
d.gauss(1)

# save the result

d.fileout('oh_result')
d.save()