... At high observing frequencies, it can be difficult to point antennas with sufficient accuracy to keep the target source in the beam. ... Reference pointing is commonly used at the VLBA for observations at 3mm. ... SETUP specifies the setup file to use for this group for pointing with continuum or very strong line sources. ... Stations in a group will share a pointing scan while a separate scan, potentially with a separate reference source, will be used for stations in another group. ...