XT is the spinnaker pole penalty. XB is the boom penalty. XM is the mast penalty. 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.