1 0 SNES Function norm 5.36093 2 1 SNES Function norm 2.18599 3 2 SNES Function norm 0.248149 4 3 SNES Function norm 0.0337716 5 4 SNES Function norm 0.00113078 6 5 SNES Function norm 1.39276e-06 7 6 SNES Function norm < 1.e-11 8errors on 9 x 9 grid: av |u-uexact| = 3.076e-03, |u-uexact|_inf = 1.334e-02 9