CONTOUR:matrix_data:VOLUMES:calculation_method

number_of_points

 Suppose n is the number of rows (columns) of the matrix. The number
 of vertical (horizontal) intermediary interpolation points defaults
 to:   10 if n<20, 5 if 20<n<50, 3 if 50<n<100, and 2 if 100<n.
 If \INTERPSIZE is used, the first parameter, ntrp, over-rides the
 defaults and the number of interpolation points in each direction
 are both set to ntrp.