h

$\tau$

$l^{\infty }$ -error

order

$l^2$ -error

order

$\frac{\pi }{2^4}$

$\frac{1}{2^4}$

0.0612

-

0.0823

-

$\frac{\pi }{2^5}$

$\frac{1}{2^5}$

0.0329

0.8954

0.0435

0.9199

$\frac{\pi }{2^6}$

$\frac{1}{2^6}$

0.0169

0.9611

0.0224

0.9575

$\frac{\pi }{2^7}$

$\frac{1}{2^7}$

0.0086

0.9746

0.0113

0.9872

$\frac{\pi }{2^8}$

$\frac{1}{2^8}$

0.0043

1.0000

0.0057

0.9873