For an Asymmetrical Sail, there are 4 measurements required when applying for a certificate.
Asymmetrical Mid Girth (AMG): is measured Mid Luff to Mid Leach under moderate tension.
Luff Length (ALU): is the distance from the projected intersection of the luff and foot with the luff line under moderate tension.
Leach Length (ALE): is the distance from the projected intersection of the leach and foot with the leach under moderate tension.
Foot(ASF): is the distance from the tack to the clew measured in the shortest path on the surface of the sail.