Computes (cross-)spectra from alm(s). If alm2 is given, cross-spectra between alm and alm2 are computed. If alm (and alm2 if provided) contains n alm, then n(n+1)/2 auto and cross-spectra are returned.
Parameters : | alm : complex, array or sequence of arrays
alms2 : complex, array or sequence of 3 arrays, optional
lmax : None or int, optional
mmax : None or int, optional
lmax_out : None or int, optional
nspec : None or int, optional
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Returns : | cl : array or tuple of n(n+1)/2 arrays
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