In some data set, there might be multiple calibrators included and any one of the calibrators might give solutions with inadequate S/N. Users might desire to use all the calibrators to achieve better S/N. smamfcal normalizes the channel visibility by the continuum vector of each record prior to solving for bandpass, which allows user to use multiple calibrators. In addition, in the polarization observations with waveplates, the bandpass solved from rr and ll might be averaged in order to gain S/N. Here is a usage of smamfcal for bandpass using multiple sources and averaging rr and ll solutions:
smamfcal vis=pol690mult_rx2.usb \
edge=1,1 flux=10 select='pol(ll,rr),source(3c454.3,uranus,neptune)' \
reant=3 interval=1000 weight=2 options=averrll