High/Low of 1st 30 seconds of day session. Midpoint of 1st hour of trading of day session. This chart was uploaded by Investor/RT 14.1.3 showing symbol: @ES#.
Day Session IBH and IBL - hidden for 1st 60 minutes of day session. Works on charts of any periodicity and any session. This chart was uploaded by Investor/RT 14.1.2 showing symbol: @ES#.