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. 2013 Feb 13;12:14. doi: 10.1186/1475-925X-12-14

Figure 3.

Figure 3

Histograms show frequency of differences in RAP between identical Signals 1 and 2 in patients 1 and 20. Histograms of differences in RAP between identical 4-min periods of Signal 1 and 2 are shown for PatID’s 1 [a; mean difference (+std) = 0.02±0.36, n = 685], and 20 [a; mean difference (+std) = −0.17±0.45; n = 718]. The histograms illustrate that despite minor mean difference in RAP between Signals 1 and 2 of all 4-min periods, the frequency of major negative and positive differences in RAP can be extensive.