GRIB2 - TABLE 3.7
SPECTRAL DATA REPRESENTATION MODE
Created 05/11/05

Number | Meaning
--- | ---
0 | Reserved
1 | The complex numbers Fnm (See Table 3.6) are stored for M>=0 as pairs of real numbers Re(Fnm), lm(Fnm) ordered with n increasing from m to N(m), first for m=0 and then for m=1, 2, ... M (see note below).
2-254 | Reserved
255 | A grid definition does not apply to this product.

Notes: 1. Values of N(m) for common truncation cases are as follows: Triangular: M = J = K, N(m) = J Rhomboidal: K = J + M, N(m) = J + m Trapezoidal: K = J, K > M, N(m) = J

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