| EI | WECC | ERCOT | QUEBEC |
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| FDR Map |
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**The spectrum is generated by running FFT analysis against FDR/UGA frequency measurement to demonstrate the frequency oscillation. Each line (from bottom-left to upper-right) represent the FFT analysis result at the corresponding timestamp. |
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** The X-axis represents spectrum frequency, range from 0-4.5Hz.
** The Y-axis represents the timestamp when FFT is executed. **The Z-axis represents spectrum magnitude, whose scale ranges from 0 -0.014 Hz. 
**Different color in this Legend are only refer to the
magnitude of the spectrum
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