We normalize spherical harmonic coefficients following Kaula [1966]*.

The formula is:
Factor(l,m) = sqrt[(l-m)!(2l+1)(2-Kron.del)/(l+m)!]
where
Kron.del = 1 for m = 0, 0 for m not= 0

Degree	Order	Normalization Factor
0	0	1
1	0	sqrt(3)
1	1	sqrt(3)
2	0	sqrt(5)
2	1	sqrt(5/3)
2	2	(1/2)sqrt(5/3)
3	0	sqrt(7)
3	1	sqrt(7/6)
3	2	(1/2)sqrt(7/15)
3	3	(1/6)sqrt(7/10)
4	0	sqrt(9)
4	1	sqrt(9/10)
		and so on...

*Kaula, W.M., Theory of Satellite Geodesy,Blaisdell, 124 pp., Waltham, 1966.

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