[R] power spectrum of eeg

[Az Ha]

Hi,
I need to find the power spectrum of an eeg and display frequency in hz. I
found two functions, spectrum or auspec but they give me frequency from 0.0
- 0.5. How do i get frequency in Hz or KHz?
Also, is it possible to plot two overlapping spectra in order to compare
their peaks etc?

Thanks for any help.
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