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UV_RADIAL /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).