-SELECT 'square', ST_AsText(ST_ApproximateMedialAxis('POLYGON((0 0,1 0,1 1,0 1,0 0))'));
-SELECT 'rect1', ST_AsText(ST_ApproximateMedialAxis('POLYGON((0 0,2 0,2 1,0 1,0 0))'));
-
+SELECT 'square', ST_AsEwkt(ST_ApproximateMedialAxis('SRID=3857;POLYGON((0 0,1 0,1 1,0 1,0 0))'));
+SELECT 'rect1', ST_AsEwkt(ST_ApproximateMedialAxis('SRID=4326;POLYGON((0 0,2 0,2 1,0 1,0 0))'));
-square|MULTILINESTRING EMPTY
-rect1|MULTILINESTRING((0.5 0.5,1.5 0.5))
+square|SRID=3857;MULTILINESTRING EMPTY
+rect1|SRID=4326;MULTILINESTRING((0.5 0.5,1.5 0.5))