Figure 5
Examples of frequency power spectra of time series of pressure changes in gas supply systems of left and right needles, for constant air volume flow rate in the right needle qr = 0.00632 l/min and selected air volume flow rates in the left needle ql. (a) ql = 0.00492 l/min, (b) ql = 0.0127 l/min, (c) ql = 0.0334 l/min, (d) ql = 0.0424 l/min.
