dspdata display units for spectrum

How can I change dspdata spectrum units, its in dB (dB/Hz for PSD), I would like the spectrum in real units.

ANSWER

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The data itself is saved in linear scale, not dB scale. It is only the plotting that displays the value in dB scale. You can try the following:

h = psd(spectrum.periodogram,randn(1024,1));
plot(h.Frequencies,h.Data);

This way the yaxis is in linear scale.