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

## Usage

power = SHPowerLC (cilm, l)

## Parameters

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

## Description

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

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