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(A) The experimental setup. Inside the magnetically shielded room OPM sensors were secured in a 3D printed scanner-cast with cables fixed into a backpack. (B) The location of the sensors for participant 1, plotted on a 3D mesh derived from the participant's de-faced structural MRI scan. Sensitive axes are shown by the blue lines. (C) The six degrees of freedom used to describe the translation and rotation of the rigid body.
