Table 1.

The number of nodes $N_n$ and elements $N_e$ of the discretizations ${\mathcal{D}}_i$ used in the 2D image reconstruction problem.

	${\mathcal{D}}_1$	${\mathcal{D}}_2$	${\mathcal{D}}_3$	${\mathcal{D}}_4$	${\mathcal{D}}_5$	${\mathcal{D}}_6$
$N_n$	260	453	532	1014	1536	2035
$N_e$	456	832	972	1900	2914	3888