Thread: Spacing patterns on chart lines?

Hi all, I need some help. Attached is my spreadsheet + chart I'm working with. We can't print in color so my Prof asked us to just use different symbols on each line and differentiate that way. So I double click any of the 4 lines, click the pattern tab, and set my pattern up. All is fine but it puts a pattern shape at EACH DATA POINT and since there's a ton all I get is a solid line and not shapes.

So, how can I spread these shapes out so I only have 10 or so on each line? Thanks in advance.