The computer model BLASPA simulates in three dimensions.  The option <Curve Position> allows the user to select the plane of the bench in which the shock wave stress contour and the displacement profile are simulated.  With the choice <X=0>, the graphs are in a plane perpendicular to the free face of the bench which traverses the blast hole; with <X=S/2>, S being the value of the Spacing, the graphs are in a plane perpendicular to the free face of the bench located half way between two holes.  The user can enter any value of X between 0 and S/2, or even a value greater than S/2 to look at the blast results at the end of a row.