similar to those of [*‘Approach 2’*]{} and therefore omitted for brevity. The]{}]{} highly imprecise electrode location case was included to demonstrate the robustness of [*‘Approach 2’*]{}. [[The reference data for the difference images contained only saline with conductivity $0.424$ S/m.]{}]{} Average, max, and min regional pixel values for the heart, left lung, and right lung inclusions for the three D-bar methods are reported in Table \[table:ACT3\_Nach\].

(300,230)

(20,0)[![\[fig:ACT3\_HnL\_Nach\] Comparison of conductivity [[(S/m)]{}]{} reconstructions from the ACT3 data (see Figure \[fig:phantoms\]) using the $\operatorname{\mathbf{t}^{\mbox{\tiny{\textbf{exp}}}}}$ approximation in Section \[sec:NachDbar\] for knowledge of true vs. incorrect electrode angles as well as boundary shape. Absolute images are in row 1[[, plotted on the same color scale]{}]{}. Difference images are in row 2[[, plotted on the same color scale.]{}]{}](GAM_ACT3_CircTank_HnL_tExp_CircTrue_ElecsTrue_DIFF_PriorOverlay_R_jet_SameScale-eps-converted-to.pdf "fig:"){width="80pt"}]{} (120,0)[![\[fig:ACT3\_HnL\_Nach\] Comparison of conductivity [[(S/m)]{}]{} reconstructions from the ACT3 data (see Figure \[fig:phantoms\]) using the $\operatorname{\mathbf{t}^{\mbox{\tiny{\textbf{exp}}}}}$ approximation in Section \[sec:NachDbar\] for knowledge of true vs. incorrect electrode angles as well as boundary shape. Absolute images are in row 1[[, plotted on the same color scale]{}]{}. Difference images are in row 2[[, plotted on the same color scale.]{}]{}](GAM_ACT3_CircTank_HnL_tExp_Oval_ElecsTrue_DIFF_PriorOverlay_R_jet_SameScale-eps-converted-to.pdf "fig:"){width="80pt"}]{} (220,0)[![\[fig:ACT3\_HnL\_Nach\] Comparison of conductivity [[(S/m)]{}]{} reconstructions from the ACT3 data (see Figure \[fig:phantoms\]) using the $\operatorname{\mathbf{t}^{\mbox{\tiny{\textbf{exp}}}}}$ approximation 