ctbl:=[ [ 1, 1, 416, 416, 1365, 1365 ], [ 1, -1, 416, -416, -1365, 1365 ], [ 1, 1, 20, 20, -21, -21 ], [ 1, -1, 20, -20, 21, -21 ], [ 1, 1, -16, -16, 15, 15 ], [ 1, -1, -16, 16, -15, 15 ] ];