The lband gain measurements ( sefd,tsys,gain jul/aug00 ) were fit to a function of azimuth and zenith angle. The fit was: g(az,za)=g0 + g1*za+g2*(za-14)^2 + g3*(za-14)^3 + g4*cos(az) + g5*sin(az) g6*cos(2az) + g7*sin(2az) + g8*cos(3az) + g9*sin(3az) 14 degrees. ... To check the validity of the gain measurements, pitch/roll/focus measurements, and the gain loss computation from the aoant program I compared the 3az term from the fit to the 3az term from the measured gain. ...