I think the following histogram of some data I am working is both visually and intellectually stimulating. Thought I'd share. The visual is comprised of:
Front Month CME ES Contract
Start Date 03/08/11
End Date 07/05/13
Trade Days 600
Unique Contract Days 617 (roll days have 2 tracked contracts)
Total 4 Tick range bars 313,424
Peak Bar Count 10 AM Eastern
FiveMinIndex is the Start Time of the 5 min block: 1 = Midnight to 04:59:999, 2 = 05:00.000 to 09:59:999, etc..
Translate 5MinIndex to Eastern clock time: (Index -1) * 5 / 60 i.e. The peak bar at 121 = (121 -1) * 5 / 60 = 10 AM