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. 1998 Apr 28;95(9):4816–4821. doi: 10.1073/pnas.95.9.4816

Figure 2.

Figure 2

Fourier Spectrum (FS) of rat pulmonary blood pressure recording. (A) FS of the first hour data shown in Fig. 1B. (B) FS of two 10-s strips shown in Fig. 1C. (C) FS of the first hour data. A plot of the locations (time and frequency) of the highest peaks of the FS in every 1-min window. (D) FS, first hour. Plot of the amplitude of the spectrum as a function of the frequency in every 1-min window on the time–frequency plane in linear scales. (E) FS, first 10 h. Similar to D but with an enlarged time span. (F) Fourier (dotted line) and Marginal Hilbert (solid line) spectra of the first 10-s strip shown in Fig. 1C, Upper.