Computes an Healpix map and its first derivatives given the alm.
The alm are given as a complex array. You can specify lmax and mmax, or they will be computed from array size (assuming lmax==mmax).
Parameters : | alm : array, complex
nside : int
lmax : None or int, optional
mmax : None or int, optional
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Returns : | m, d_theta, d_phi : tuple of arrays
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