setup done: square       side length = 4.000
            grid               Mx,My = 21,21
            spacing            dx,dy = 0.200,0.200
  0 SNES Function norm 9.14251 
  1 SNES Function norm 1.70712 
  2 SNES Function norm 1.25963 
  3 SNES Function norm 0.739384 
  4 SNES Function norm 0.0261039 
  5 SNES Function norm 0.00243901 
  6 SNES Function norm 6.47302e-05 
  7 SNES Function norm 6.68307e-08 
number of Newton iterations = 7; result = CONVERGED_FNORM_RELATIVE
errors:    av |u-uexact|  = 1.287e-03
           |u-uexact|_inf = 7.882e-03
