Here is a quick hack which should help.
I am using basically the very same hatch function I posted here near three years ago. This time, for a change, I have chosen the last function argument to be the number of hatch lines (minus 1) rather than the "distance" between two lines.
The modification you suggested worked perfect! Thanks for the assistance. The blue line data represents calculated moment acting on the circular body. Using Mathcad Prime 3.0 for reference, so I don't have a good way of showing gridlines on this figure.