Multiply alm by a function of l. The function is assumed to be zero where not defined.
alm : array
The alm to multiply
fl : array
The function (at l=0..fl.size-1) by which alm must be multiplied.
mmax : None or int, optional
The maximum m defining the alm layout. Default: lmax.
inplace : bool, optional
If True, modify the given alm, otherwise make a copy before multiplying.
The modified alm, either a new array or a reference to input alm, if inplace is True.
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