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. 2011 May 20;6(5):e19400. doi: 10.1371/journal.pone.0019400

Figure 1. Examples of the power spectral density (PSD) of a 24 h R-R interval series in a double logarithmic plot (decadic logarithm as indicated by ‘log10’).

Figure 1

The slope β denotes the slope of the linear regression calculated using the averaged PSD (grey circles; frequency range: 10−4 to 10−2 Hz). Top: male subject, age 7.9 years; bottom: male subject, age 18.1 years.