Write alms to a fits file.
In the fits file the alms are written with explicit index scheme, index = l*l + l + m +1, possibly out of order. By default write_alm makes a table with the same precision as the alms. If specified, the lmax and mmax parameters truncate the input data to include only alms for which l <= lmax and m <= mmax.
Parameters : | filename : str
alms : array, complex
lmax : int, optional
mmax : int, optional
out_dtype : data type, optional
mmax_in : int, optional
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