Display difference of two history tag on easy chart

Hi
For easy chart pen is it possible to display difference of two history tag?

I don’t have any history tags to test my theory on, but you should be able to use a calculated pen.

Function Difference, and then set your pens to be the two tags you are wanting to calculate the difference of.

https://docs.inductiveautomation.com/display/DOC79/Easy+Chart+-+Calculated+Pens

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Hi
Thanks