1 0 SNES Function norm 3.86571 2 1 SNES Function norm 1.3323 3 2 SNES Function norm 1.81987e-06 4 3 SNES Function norm 1.372e-11 5errors on 9 x 9 grid: av |u-uexact| = 3.076e-03, |u-uexact|_inf = 1.334e-02 6