Multiple selections on a slicer

Hi, 

I was just wondering if there's a way to show multiple items from a slicer on a graph, without it adding them together. 

I'd like to see the different properties visualised together on a line graph. 

Eg: in the below, when i select both properties it just combines them, but I'd like to see them as seperate lines so as to compare.

Anyone able to help?

Thank you!

Sonia