Oil prices ticked up in early trading on Wednesday after ending the previous session up more than 4% on worries that the Iran-Israel conflict could disrupt supplies.

Crude oil prices remain elevated even after pulling back from the 5-month high hit on Friday. Explore the top targets to watch.

U.S. and global benchmark oil prices have seen their share of big moves since Israel launched attacks on Iran late last week, but there’s one indicator that helps investors put into perspective just how serious the situation is — and can become.