$ N_x $ | $ N_y $ | $ N_{ts} $ | $ L_2 D $ | $ L_2 R, \epsilon = 10^{-2} $ | $ L_2 R, \epsilon = 10^{-4} $ | $ L_2 R, \epsilon = 10^{-6} $ |
[0.5ex] 20 | 10 | 1 | 0.00318557 | 0.00329745 | 0.00318659 | 0.00318559 |
40 | 20 | 4 | 0.00206132 | 0.00211980 | 0.00206182 | 0.00206133 |
80 | 40 | 16 | 0.00151241 | 0.00156704 | 0.00151286 | 0.00151242 |
160 | 80 | 64 | 0.00125001 | 0.00130976 | 0.00125050 | 0.00125002 |