Fig. 3. Relative frequency of examinees where the largest change of thorax temperature during examinations of medium (10-30 s) or long (>30 s) duration was a phase of thoracic heating (T_ths>+2°C), approximately constant temperature (T_ths±2°C) or cooling (T_ths<-2°C). 100 % = 34 examinees and 66 examinees for durations of 10-30 s and >30 s, respectively.