Change the frame in which the image reports its spectral values
imagename -- name of casa image file to process on
output -- name of output image '' means modify the input image itself
default: '';
outframe -- new spectral frame in which the frequency or
velocity will be reported for.
Options: 'lsrk','lsrd','bary','geo','topo','galacto',
'lgroup','cmb'
default: 'lsrk'
>>>
epoch -- when outframe is 'topo' or 'geo' a time in UTC is needed
to decide when to do the frequency conversion. '' is to use
the epoch of the input image
default= ''
restfreq -- Specify rest frequency to use for output image
default=''; '' means use the restfrequency already in input image
For example for
NH_3 (1,1) put restfreq='23.694496GHz'