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

 

or put up the instrument on the chart as i.e /dx-eur/usd and it will give a chart of the difference

 

Am I doing something incorrectly?

If I enter /ZC-/ZS I am just getting both underlyings graphed together and not the difference.

 

negative 540

 

Thanks for your help ammo. I must have had another study still on.

 

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?