setup done: grid  Mx,My = 21,21  with spacing  dx,dy = 0.2000,0.2000
  0 SNES Function norm 6.87047 
  1 SNES Function norm 2.6194 
  2 SNES Function norm 0.636712 
  3 SNES Function norm 0.139165 
  4 SNES Function norm 0.0183007 
  5 SNES Function norm 0.00229479 
  6 SNES Function norm 7.6287e-05 
  7 SNES Function norm 9.40178e-08 
  8 SNES Function norm < 1.e-11
errors:     av |u-uexact|  = 1.287e-03    |u-uexact|_inf = 7.882e-03
