xyio.h
/*
* XYIO stuff - modeled after miriad's xyio
* assumed image.h has been loaded
*/
image *xyopen ( int *, int, int *, string,int *);
void xyclose ( int );
void xyread ( int, int, real *);
void xywrite ( int, int, real *);
void xysetpl ( int, int, int *);