On a zone 2 ride and this HR histogram has never looked right to me. The gray area is everything below 130 and the thin green line is everything over 147. So Z2 or whatever target HR is all shown in just a tiny 5-8 pixel vertical area. The normal HR data field looks fine, auto-scales and color codes, but the one on workout is nearly useless. This is an 840, all up to date.
