REAL values for GRIB section 2, the grid description section.

A REAL array of at least (10 + nn) elements, where nn is the number of vertical coordinate parameters

ElementContentsecCodes keys
1Angle of rotation.angleOfRotationInDegrees
2Stretching factor.
3-10Reserved. Set to 0.
11-(10+nn)Vertical coordinate parameters. nn is given in KSEC2(12).