Selecting and graphing specific frequency range of Spectrogram

2016 7 11
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Hi! I'm fairly newish to MATLAB and am trying to get the data of a spectrogram to perform an autocorrelation, but only want to do it on a specific frequency range (i.e. from 0 to 50 Hz). How would I get this data and still preserve the time domain?
This is what I've tried, but it only gives me a straight line when I graph f, and I'm pretty sure it's completely wrong.
figure;
spectrogram(newx, 256, 225, 512, 2000, 'yaxis');
colormap(jet);
[s, f, t] = spectrogram(newx, 256, 225, 512, 2000, 'yaxis');
plot(f);
Thanks in advance for any help!

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