dof error1 postproc1 4 2.50000000e-01 {} 16 6.25000000e-02 1.99998 64 1.56250000e-02 1.99998 256 3.90625000e-03 1.99998 1024 9.76562500e-04 1.99998 4096 2.44140625e-04 1.99998 16384 6.10351562e-05 1.99998 65536 1.52587891e-05 1.99998 262144 3.81469727e-06 1.99998 1048576 9.53674316e-07 1.99998