13 4 -40 -40 -40 -40 40 -40 -40 40 40 -40 -40 40 40 -40 40 40 40 40 40 40 -40 40 -40 -40 0. 0. 0. 0. 0. .2 .4 .8 1. 1. 1. 1. 1.