EI WECC ERCOT QUEBEC

FDR Map

**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.

** 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