Gaussian beam window function
Computes the spherical transform of an axisimmetric gaussian beam
For a sky of underlying power spectrum C(l) observed with beam of given FWHM, the measured power spectrum will be C(l)_meas = C(l) B(l)^2 where B(l) is given by gaussbeam(Fwhm,Lmax). The polarization beam is also provided (when pol = True ) assuming a perfectly co-polarized beam (e.g., Challinor et al 2000, astro-ph/0008228)
Parameters : | fwhm : float
lmax : integer
pol : bool
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Returns : | beam : array
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