walk minutes ÷ ergs produced, measured tickets only — the centre line is 1.0, the calibration pace the prices assume: the bar grows left when the primary operator is faster than priced, right when slower · needles are the compared operators on the same scale · faded = too few tickets to trust · ped signals are timed as 2× their final side (each side is its own visit; the crossing belongs to the crosswalk ticket)