Fig. 6

An example of STL decomposition that decomposed data into original, trend, seasonal, and residual components for (a) frequency in seconds and (b) frequency in hours, respectively, at a pressure level of 5 MPa.

An example of STL decomposition that decomposed data into original, trend, seasonal, and residual components for (a) frequency in seconds and (b) frequency in hours, respectively, at a pressure level of 5 MPa.