Source
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<description>Include the Prolate Spheroidal (PS) funtion as the anti-aliasing
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operator in the gridding convolution functions used for gridding.
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Setting this parameter to true is necessary when aterm is set to
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false. It can be set to false when aterm is set to true, though
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with this setting effects of aliasing may be there in the image,
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particularly near the edges.
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When set to true, the .pb images will contain the fourier transform
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of the of the PS funtion. The table below enumarates the functional
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-
effects of the psterm, aterm and wprojplanes settings.
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effects of the psterm, aterm and wprojplanes settings. PB referes to
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the Primary Beam and FT() refers to the Fourier transform operation.
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Operation aterm psterm wprojplanes Contents of the .pb image
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----------------------------------------------------------------------
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AW-Projection True True >1 FT(PS) x PB
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False PB
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A-Projection True True 1 FT(PS) x PB
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False PB
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W-Projection False True >1 FT(PS)