/filetype (char[])
String indicating the type of file.
/num_voxels (int[3])
Number of voxels in the x-, y-, and z- directions.
/voxel_width (double[3])
Width of a voxel in centimeters.
/lower_left (double[3])
Cartesian coordinates of the lower-left corner of the plot.
/data (int[][][])
Data for each voxel that represents a material or cell ID.