experiment, referred to as “alternative boundary”. []{data-label="fig:ACT4_circ_elecsNoisy"}](ACT4circ_NoisyElecs-eps-converted-to.pdf "fig:"){width="120pt"}]{} (130,0)[![Boundary shapes and electrode locations tested for the ACT3/ACT4 data. Left: True boundary shape with incorrect electrode locations in red. Middle: Oval (incorrect) boundary shape. Right: An incorrect boundary created from a picture of the experiment, referred to as “alternative boundary”. []{data-label="fig:ACT4_circ_elecsNoisy"}](ACT4circ_Oval1-eps-converted-to.pdf "fig:"){width="120pt"}]{} (260,0)[![Boundary shapes and electrode locations tested for the ACT3/ACT4 data. Left: True boundary shape with incorrect electrode locations in red. Middle: Oval (incorrect) boundary shape. Right: An incorrect boundary created from a picture of the experiment, referred to as “alternative boundary”. []{data-label="fig:ACT4_circ_elecsNoisy"}](ACT4circ_Chest1-eps-converted-to.pdf "fig:"){width="120pt"}]{}

(20,125) (155,125)

(262,125)

(405,110)

(0,0)[![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_NoisyElecs-eps-converted-to.pdf "fig:"){height="75pt"}]{} (105,0)[![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 