RAlt = Required Altitude. This is the number you compare to the altimeter (assuming corroct baro is in altimeter). "Height" refers to "above ground elevation" while "Altitude" refers to "above sea level". This is the ICAO phrasology used by airlines around the world.
There is a problem with this infobox, concerning multitargets. To make it easy, it would only show the ReqA relative to T>, and would make it confusing while looking at another multitarget. To make it complicated, we should need Multitarget ReqA, T>ReqA etc. I am lowering this priority for when I have more time.