Graph legend doesn't match data?

[#1]

I have a line graph  with a legend. I used the Dimension Limits to limit the number of items shown to the largest 5 values. So the graph has 5 lines on it. But the legend for those lines shows many more than 5 items. 

How do I limit the legend to display only the 5 that are displayed?

[giakoum]

Dimension limits only apply to the first expression.

It will not reduce the number of lines you see, only the values per dimension for the 1st expression