Grid Size

${\text{Rate}}_{L_2}$

${\text{Rate}}_{L_{\infty }}$

$L_2$

$L_{\infty }$

11 ´ 11

2.8009

2.8201

0.1899

0.0113

21 ´ 21

2.8458

2.8733

0.5934

0.0128

31 ´ 31

2.8619

2.8934

1.1231

0.0132

51 ´ 51

2.8458

2.8733

2.4713

0.0136