# The soot field's direction lane (the FIRE_FIXTURE driver): 4 m/s FROM
# 115 (meteorological; TO = (-sin F, cos F) screen, so the plume bends
# toward -x/-y - the quadrant opposite the default 25 lane's drift).
# Same strength as soot-wind (4 m/s), so the column shape assertions
# mirror it; the drift stays positive along the wind axis by
# construction (the probe projects onto it). Ends before the fixture
# orb downwind of THIS direction ignites.
# weather: wind 4 115
# frames: 1560
