Figure S1. Comparison of the distribution of the absolute mean systematic position errors (SE) of the individual markers relative to the carina (blue) and the bony anatomy (dark red). The distribution of absolute mean SE is given for each marker subgroup separately and compared between a carina-based registration and a bony anatomy-based registration. Results are given in the left-right, craniocaudal, and anterior-posterior direction. (EPS 113Â kb