Formulas:
H4T line=maximum price for current day+ATR,
L4T line=minimum price for current day-ATR,
H4 line=maximum price for previous day+ATR,
L4 line=minimum price for previous day-ATR,
where ATR=ATR with ATRPeriod for previous day.
For this indicator must be installed indicator BF_ATR from viewtopic.php?f=17&t=2634
MT4/MQ4 Version
viewtopic.php?f=38&t=64208
The indicator was revised and updated