What about respiration ?
0 – 0.5 cm (10 Pts)
0.5 – 1.0 cm (8 Pts)
1.0 – 1.5 cm (9 Pts)
1.5 – 2.0 cm (5 Pts)
Amplitude:
Jan-Jakob Sonke et al, IJROBP 2007
SD = 0.35 peak-peak