When reading an order flow chart, you compare price on the bid against the offer, diagonally.
Not horizontally. Markets have a bid and offer. What you want to do is compare their relationship.
An order flow chart allows a trader to see the volume traded on the bid and the volume traded on the offer. You can use range charts, minute charts, renko charts, whatever type of chart you are comfortable looking it; order flow can be applied to it.
