’briggsabs’ weighting

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5.2.11.6 ’briggsabs’ weighting

For weighting=’briggsabs’, a slightly different Briggs weighting is used, with

w = -----ωi----- i WkR2 + 2σ2R

(5.11)

where R is the robust parameter and σ_R is the noise parameter.

This choice brings up the sub-parameters:

weighting      = ’briggsabs’  #   Weighting to apply to visibilities
     robust    =      0.0     #   Briggs robustness parameter
     noise     =  ’0.0Jy’     #   noise parameter for briggs weighting when rmode=’abs’
     npixels   =        0     #   number of pixels to determine uv-cell size 0=> field of view

Otherwise, this works as weighting=’briggs’ above (§ 5.2.11.5).

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