setup done: grid  Mx,My = 21,21  with spacing  dx,dy = 0.2000,0.2000
  0 SNES Function norm 5.52931 
  1 SNES Function norm 0.695513 
  2 SNES Function norm 0.224211 
  3 SNES Function norm 0.0852096 
  4 SNES Function norm 3.7195e-07 
  5 SNES Function norm < 1.e-11
errors:     av |u-uexact|  = 1.287e-03    |u-uexact|_inf = 7.882e-03
