typedef struct {
int nx;
int ny;
int nz;
int mode;
int nxstart;
int nystart;
int nzstart;
int mx;
int my;
int mz;
float xlen;
float ylen;
float zlen;
float alpha;
float beta;
float gamma;
int mapc;
int mapr;
int maps;
float amin;
float amax;
float amean;
int ispg;
int nsymbt;
char extra[116];
float xOrigin;
float yOrigin;
int nlabl;
char label[10][80];
} MRChead;