Data array itself. The flat data representation is used. For example, matrix [nx x ny] is presented as flat (1d-) array with length nx*ny. The element with indexes {i, j, k} is a[i+nx*j+nx*ny*k] (indexes are zero based).
Variable of mglData:intnx
Number of points in 1st dimensions (’x’ dimension).
Variable of mglData:intny
Number of points in 2nd dimensions (’y’ dimension).
Variable of mglData:intnz
Number of points in 3d dimensions (’z’ dimension).
Variable of mglData:char *id
Column (or slice if nz>1) names – one character per column.