XH is the headroom penalty . 1.5 P is the mainsail luff mesured between two black bands on the mast or between the lowest possible mainsail tack and the highest possible mainsail head. CM is the circumference of a rotating mast. E is the mainsail foot. For unusual sail shapes, more girths will be used to measure the exact sail area.
T is the headboard width.
B is the height of the foot roach. In the case of unusual mainsail shapes, the measurer shall measure extra girths. LP is the jib perpendicular measured from the after jib clew position to the most forward headstay. CE is the headfoil circumference. All headsail set on a headstay will be measured as a jib.