Please consider to set the spectrum type correctly:
[___] = plomb(_,<https://de.mathworks.com/help/signal/ref/plomb.html#buio4ln-1-spectrumtype spectrumtype>) specifies the normalization of the periodogram.
Set spectrumtype to 'psd', or leave it unspecified, to obtainpxx as a power spectral density.
Set spectrumtype to 'power' to get the power spectrum of the input signal.
Set spectrumtype to 'normalized' to get the standard Lomb-Scargle periodogram, which is scaled by two times the variance ofx.
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