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15 - Horizontal Leg Length - Joint Root to Undercut
The horizontal leg length is the distance from the joint root to where the pool intersects the original surface of the lower plate on the right [point 4 if no undercut or underfill].

This measurement is only as good as the position of the upper plate (which show where the joint root is)! These points are only an estimate unless scribe marks were made to position point 2 exactly.
Horizontal Leg Length - Joint Root to Undercut Pic0
Horizontal Leg Length - Joint Root to Undercut Pic1
Horizontal Leg Length - Joint Root to Undercut Pic2