Four pairs, x then y, read by the LD HL at SET_ARRIVAL_HEADING+11: nothing and +32 (down, for a north door), -32 and nothing (left, east), nothing and -32 (up, south), +32 and nothing (right, west). 32 is a full-speed heading. An earlier note took these for the mushroom's wander; only ENTER_ROOM reads them.