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20.21.2 /ZERO

[ADVANCED\]UV_RADIAL [x0 y0 Rota Incli] /ZERO [Flux] [/SAMPLING QSTEP [Unit [QMIN QMAX]]]

Add the zero spacing flux to the azimutal average. If no value is given, the zero spacing flux is extrapolated from the shortest baselines using a parabolic interpolation centered on (u,v)=(0,0).