I need to develop a software to display the cascade plot above, but I do not understand how the cascade plot work. As you can see, the abscissa displays frequency. The ordinate axis shows the time. The third axis is the speed. What data is needed in order to display such a plot?: the set of (Frequency, Time, and Speed)? I want to know the order of drawing such a plot. Fix the time, then draw the speed over frequency? or fix the frequency, then draw the speed over time? Could you give me some examples to help me understand how the cascade plot works?

POINT: Brng #3 X1Relj 1450 Right MACHINE: Turbine From 20FEB2009 23:10:00.0 To 21FEB2009 03:22:02.5 Srtdown 03:22:02.5 WINDOW: None SPECTRAL LINES: 400 RESOLUTIO Hertz 03:22:02.5 3840 3430 3390 3642 03:19:20.7 03:16:30.3 03:13:36.0 3240 2880 03:10:47.3 03:06:26.9 03:05:07.4 2430 03:03:02.6 2360 03:01:031 2800 02:59:31.7 3250 3600 3601 3600 3600 3601 02:55:00.0 02:40:00.0 02:25:00.0 02:10:00.0 01:55:00.0 01:40:00.0 01:25:00.0 01:10:00.0 00:55:00.0 3601 3600 3602 3601 3601 3601 00:40:00.0 00:25:00.0 00:10:00.0 23:55:00.0 23:40:00.0 23:25:00.0 23:10:00.0 3601 3601 3602 3601 3601 rpm 100 FREQUENCY: 10 Hertzjdiv 50 150 200 0.005@ 168 Hertz