Is it 23 meters from where the mat is placed to the jack or from either end of centre line to jack in lawn bowls?

In lawn bowls, the distance of 23 meters is measured from the mat's front edge where the bowler delivers the bowl to the jack. This means it is 23 meters from the mat to the jack, not from either end of the center line. The center line serves as a guideline for the placement of the mat but does not change the measurement to the jack.