Decision 89/471/EEC is hereby amended as follows:
Point 2 of Part 1 of the Annex is replaced by the following:
'2. The lean meat content of the carcase is calculated on the basis of the following formula:
^y = 54,139 - 0,71062 x1 + 0,21842 x2
where
^y = the estimated percentage of lean meat in the carcase;
x1 = the thickness of backfat (including rind) in millimetres, measured at 7 cm off the midline of the split carcase, between the second and third last ribs;
x2 = the thickness of the muscle in millimetres, measured at the same time and in the same place as x1.
The formula shall be valid for carcases weighing between 50 and 120 kilograms.`