What is the reference for the power/frequency scale bar on the right in Spectrogram?

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Jan Ali
Jan Ali 2021-5-2
Dear experts,
Can anyone help me how to get the power/frequency scale in Spectrogram using STFT?
What is the reference for the power/frequency scale bar on the right?
Additionally, how to plot actual time interval? I want it to plot on the time axis from for exp. 5083s time span but using the spectrogram built in function plots from 0 s as seen below.
I appreciate if anyone can help me with this.

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