Compute the power spectral density of a complex function for a single spherical harmonic degree.

## Usage

psd = SHPowerDensityLC (cilm, l)

## Parameters

psd : output, real(dp)
Power spectral density of the complex function for spherical harmonic degree l.
cilm : input, complex(dp), dimension (2, lmaxin+1, lmaxin+1)
The complex function expressed in complex spherical harmonics.
l : input, integer
The spherical harmonic degree. This must be less than or equal to lmaxin.

## Description

SHPowerDensityLC will calculate the power spectral density of a complex function expressed in complex 4-pi normalized spherical harmonics for a single spherical harmonic degree l. This is calculated as:

psd = Sum_{i=1}^2 Sum_{m=0}^l | cilm(i, l+1, m+1) |**2 / (2l + 1).