setup done: square       side length = 4.000
            grid               Mx,My = 21,21
            spacing            dx,dy = 0.200,0.200
  0 SNES Function norm 90.9259 
  1 SNES Function norm 17.3878 
  2 SNES Function norm 5.60528 
  3 SNES Function norm 2.13024 
  4 SNES Function norm 9.29874e-06 
  5 SNES Function norm 6.906e-11 
number of Newton iterations = 5; result = CONVERGED_FNORM_RELATIVE
errors:    av |u-uexact|  = 1.287e-03
           |u-uexact|_inf = 7.882e-03
