for each isocenter position. Cadavers 1 and 3 have single chamber pacemakers (RV leads); cadavers 2, 4, and 5 have dual chamber pacemakers (RA and RV lead). Cadaver 5 also had 10 abandoned leads. For single chamber pacemakers a temperature probe was placed at the lead-tip and the remaining temperature probes were placed in remote tissue for reference. For dual chamber pacemakers, the temperature probes were placed at the RA and RV lead-tips and two probes were placed in remote tissue for reference. For the cadaver with abandoned leads two temperature probes were placed close to the lead-tips connected to the pacemaker and one probe was placed close to lead-tip of one abandoned lead (ALT). Note that in cadaver 2 the RV temperature probe was not close enough to the RV lead-tip (accidentally partially withdrawn) to obtain temperature data.