au.restFrequency(vis, spw, source)Inputs:
CASA <2>: au.restFrequency('calibrated_final.ms',0,0) Velocity of central channel = 3409.333593 km/s (width = 6.774316 km/s) Width of spw = 867.112454 km/s, 87.5% = 737.045586 km/s, half that = 368.522793 km/s Out[2]: array([ 6.91473076e+11])-- ToddHunter - 2015-06-17