Compute the power of a real function for a single spherical harmonic degree.
power = SHPowerL (cilm, l)
power : output, real(dp)
: Power of the function for a single spherical harmonic degree l.
cilm : input, real(dp), dimension (2, lmaxin+1, lmaxin+1)
: The spherical harmonic coefficients of the function.
l : input, integer(int32)
: The spherical harmonic degree. This must be less than or equal to lmaxin.
SHPowerL will calculate the power of a function expressed in real 4-pi normalized spherical harmonics for a single degree l. This is explicitly calculated as:
power = Sum_{i=1}^2 Sum_{m=0}^l cilm(i, l+1, m+1)**2.
shpowerdensityl, shcrosspowerl, shcrosspowerdensityl, shpowerspectrum, shpowerspectrumdensity, shcrosspowerspectrum, shcrosspowerspectrumdensity, shadmitcorr