setup done: grid  Mx,My = 11,11  with spacing  dx,dy = 0.4000,0.4000
  0 SNES Function norm 3.8949 
  1 SNES Function norm 0.595977 
  2 SNES Function norm 1.33042e-06 
  3 SNES Function norm < 1.e-11
errors:     av |u-uexact|  = 7.156e-03    |u-uexact|_inf = 2.550e-02
