One of the thinks i find extremely helpful in orderflow trading is the bookmap from bookmap or the heatmap from jigsaw, i personally use bookmap. Was a real eye opener for me since it holds much and much more information than just the DOM.
I guess "Bookmap" is as "Heatmap", a marketing term referring to a Jigsaw's product. Anyway ... You DON'T really NEED it for tape / DOM reading. It prints distinctly the numerical value of lifted bids & offers @ each price. If that's what I think it is, I reproduced it via Excel RTD but don't use it anymore.