Charting the Difference on TOS

Does anyone know how to chart the price difference between two futures contracts using TOS? I have a feeling that it isn’t that difficult but I am not able to figure it out. I can compare two underlying’s but I am looking for the difference between them.

Thanks
 
put up the one instrument,then study, add study, bottom of studies list it says compare,add another instrument
 
Quote from ammo:


Am I doing something incorrectly?

If I enter /ZC-/ZS I am just getting both underlyings graphed together and not the difference.
 
Is this what you mean? Under studies there is a "compare to" option all the way at the bottom. Then if necessary change the scale to % view.
 

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Quote from riskaddict:

Is this what you mean? Under studies there is a "compare to" option all the way at the bottom. Then if necessary change the scale to % view.

I was able to figure this one out as well after watching a TOS video. Thanks though.
 
Is it possible to chart the difference between two contracts using different ratios? Example: Long 2 April Platinum and Short 1 April Gold?
 
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