Figure 4
From: Quantitative lung SPECT applied on simulated early COPD and humans with advanced COPD
Frequency functions of the CV- values for simulated distributions. The mean frequency functions of 20 noise realisations of the CV values corresponding to distribution 1, the simulated normal (solid line); distribution 4, ‘1 cm0% 10% evenly’ (dash-dotted); distribution 5, ‘1 cm0% 12% centred’ (dash-dot-dot-dotted); and distribution 8, ‘2 cm50% 48% evenly’ (dashed).Only four curves out of nine are shown for clarity.