[ADVANCED\]UV_CIRCLE [x0 y0 Rota Incli] /ZERO [Flux]
[/SAMPLING QSTEP [Unit [QMIN QMAX]]]
Add the zero spacing flux to the azimutal average. If no value is giv-
en, the zero spacing flux is extrapolated from the shortest baselines
using a parabolic interpolation centered on (u,v)=(0,0).