Code table 3.7 - Spectral data representation mode

      Code
      figure      		Meaning
      0Reserved
      1The complex numbers Fnm (see code figure 1 in Code Table 3.6) are stored for m≥0 as pairs of real numbers Re(Fnm), Im(Fnm) ordered with n increasing from m to N(m), first for m = 0 and then form m=1,2,...M (see Note 1, below).
      2-254Reserved
      255Missing

      Notes:

      (1) Values of N(m) for common truncations cases:
        TriangularM = J = K,N(m) = J
        RhomboidalK = J + M,N(m) = J+m
        TrapezoidalK = J, K > M,N(m) = J