ER2-ES spread ratio ???????

I scalp the ER2 contract. I am looking to spread ER2 against ES. I am curious if anyone has any ideas on the correct spread ratio.

ER2
tick=$10
point=$100
Average True Range(30 days)=13.5


ES
tick=$12.50
point=$50
Average True Range(30 days)=13.6


Am I correct in thinking 1(ER2)-2(ES) ratio is the correct spread ratio.


Any thoughts are greatly appreciated.
 
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