noisy or incorrect electrode locations.[]{data-label="fig:CSU_elecSetups"}](ACE1chest_Oval1-eps-converted-to.pdf "fig:"){height="75pt"}]{} (220,0)[![Boundary shapes and electrode locations tested for the ACE1 phantoms. From [[left to right:]{}]{} True boundary shape with correct and incorrect electrode angles, two ellipses of different eccentricities, and finally a circular boundary shape. The green circles denote the ‘true’ electrode locations whereas the red stars denote the noisy or incorrect electrode locations.[]{data-label="fig:CSU_elecSetups"}](ACE1chest_Oval2-eps-converted-to.pdf "fig:"){height="75pt"}]{} (330,0)[![Boundary shapes and electrode locations tested for the ACE1 phantoms. From [[left to right:]{}]{} True boundary shape with correct and incorrect electrode angles, two ellipses of different eccentricities, and finally a circular boundary shape. The green circles denote the ‘true’ electrode locations whereas the red stars denote the noisy or incorrect electrode locations.[]{data-label="fig:CSU_elecSetups"}](ACE1chest_Circ-eps-converted-to.pdf "fig:"){height="75pt"}]{}

(10,85) (135,85) (245,85) (350,85)

For both the ACT4 and ACE1 data, the measured currents/voltages were used to synthesize the measurements that would have occurred if trigonometric current patterns of amplitude 1 mA had been applied. Reconstructions for all examples were performed on a uniform $33\operatorname{\times}33$ $k$-grid of stepsize $h_k=0.4706$ using a cutoff radius $R=4.0$ and nonuniform truncation threshold of 0.4. The threshold was enforced such that $\operatorname{S_{12}^{\mbox{\tiny{\textbf{exp}}}}}(k)=0$ if $|\Re(\operatorname{S_{12}^{\mbox{\tiny{\textbf{exp}}}}}(k))|>0.4$ or $|\Im(\operatorname{S_{12}^{\mbox{\tiny{\textbf{exp}}}}}(k))|>0.4$, and similarly for $\operatorname{S_{21}^{\mbox{\tiny{\textbf{exp}}}}}$. For consistency, the DN matrices $\mathbf{L}_\gamma$, $\mathbf{L}_\sigma$, and $\mathbf{L}_1$ were all 