Vertical Gridlines for Trig Function Graphs in SWP

I am struggling to place vertical gridlines for trig graphs at the standard
spacing of 90-degrees between gridlines, with a tick-mark at every
45-degrees. At present SWP is placing a vertical gridline every 20 degrees. Can anyone assist me with fixing this? Many thanks!

John MacKendrick's picture

The MuPAD commands that are

The MuPAD commands that are accessed via the SWP interface do not provide precise control over where the gridlines are placed. 

It is still possible to manually enter gridlines as described at