Division 3 The lean meat content of carcases shall be calculated according to the following formula:

the estimated percentage of lean meat in the carcase,

the thickness of visible fat on the midline of the split carcase in millimetres, covering the glutaeus medius muscle (in millimetres),

the visible thickness of the lumbar muscle on the midline of the split carcase, measured as the shortest connection between the front (cranial) end of the glutaeus medius muscle and the upper (dorsal) edge of the vertebral canal (in millimetres).