Table 1.

CPU-time in second (iterative step) needed to reach the convergence tolerance.

Scheme	$\mathit{\nu }$ $=1$	$\mathit{\nu }=1.0\times {10}^{-2}$	$\mathit{\nu }=1.0\times {10}^{-4}$
I	50.696 (4)	174.857 (14)	424.661  (41)
II	49.432 (4)	112.317 (6)	—
III	78.703 (7)	—	—