nine points fourth order laplacian scheme. rms error = .2172350E-07 rms error/rms zta = .120E+01 percent. i j analytical sol estimated sol. i j analytical sol estimated sol 1 4 .30498760E-05 .30498760E-05 2 4 -.41585830E-04 -.40985850E-04 3 4 -.24536510E-04 -.24165770E-04 4 4 .30636260E-04 .30262060E-04 5 4 .47685580E-04 .47081320E-04 6 4 .30498700E-05 .30480420E-05 7 4 -.41585830E-04 -.40988490E-04 8 4 -.24536500E-04 -.24141550E-04 9 4 .30636270E-04 .30163490E-04 10 4 .47685580E-04 .47685580E-04 nine points second order laplacian scheme. rms error = .2346851E-06 rms error/rms zta = .129E+02 percent. i j analytical sol estimated sol. i j analytical sol estimated sol 1 4 .30498760E-05 .30498760E-05 2 4 -.41585830E-04 -.34947030E-04 3 4 -.24536510E-04 -.20471330E-04 4 4 .30636260E-04 .26373030E-04 5 4 .47685580E-04 .40848730E-04 6 4 .30498700E-05 .29508450E-05 7 4 -.41585830E-04 -.34947040E-04 8 4 -.24536500E-04 -.20471320E-04 9 4 .30636270E-04 .26373040E-04 10 4 .47685580E-04 .47685580E-04 five points second order laplacian scheme. rms error = .1656866E-06 rms error/rms zta = .914E+01 percent. i j analytical sol estimated sol. i j analytical sol estimated sol 1 4 .30498760E-05 .30498760E-05 2 4 -.41585830E-04 -.36936440E-04 3 4 -.24536510E-04 -.21700850E-04 4 4 .30636260E-04 .27602550E-04 5 4 .47685580E-04 .42838140E-04 6 4 .30498700E-05 .29508450E-05 7 4 -.41585830E-04 -.36936440E-04 8 4 -.24536500E-04 -.21700840E-04 9 4 .30636270E-04 .27602560E-04 10 4 .47685580E-04 .47685580E-04