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Uses scipy.signal to perform the convolution of one (or two) top-hat functions with a Gaussian, and reports the FWHM of the result.
See also primaryBeamArcsec to compute the ALMA primary beam for a specific observation, or at a specific frequency,
and gjincBeam to compute the restoring beam appropriate for a total power image produced by sdimaging. The inverse of this function is deconvolveDiskFromBeam.