Table 2: The error estimates for nonconforming FE scheme.

1/2 1/4 1/8 1/16 1/32 1/64

1.1264 014.6572 021.8679 02 8.0004 03 3.1977 03 1.3906 03
order / 1.5552 1.5790 1.52801.5817 1.5164
8.1523 023.1059 02 1.0260 02 3.1725 03 9.4359 04 2.7340 04
order / 1.6201 1.7399 1.7983 1.8336 1.8578
1.0995 02 2.7109 036.4263 04 1.5941 04 3.9258 05 9.3430 06
order / 2.0139 2.0539 2.0078 2.0151 2.0498