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where μ = sinθ with λ the longitude and θ the latitude of the grid point, T the triangular spectral truncation number, eimλ are the Fourier functions. The
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\overline{P}_n^m |
are the normalised associated Legendre polynomials of the first kind of degree n and order m are denoted by
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\overline{P}_n^m |
with the normalisation defined by:
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