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Multiple PSD in same graph - Matlab

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sommer lieber
sommer lieber 2015-6-30
I intend to plot multiple Power Spectral Densities on the same graph. I am using the following to plot the power spectral density for a single signal.
hss = dsp.SpectrumAnalyzer('SampleRate', Fs);
step(hss,rx);
release(hss);
However, if I were to plot another signal in the same spectrum analyzer using hold on doesn't seem to help
hss = dsp.SpectrumAnalyzer('SampleRate', Fs);
step(hss,rx); hold on;
step(hss,tx);
release(hss);
Could someone guide me on how to go about with this.

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