matplotlib - Make a spectrogram of existing data in python -

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i have data i'd represent spectrogram or heat-map in python 2.7. @ moment, have array of 3 columns (time, channel number , flux), , thousands of rows represent each data point. how able plot data points if want time on x axis, channel number on y axis, , magnitude of flux represented colour?

i've looked through fair few questions on here, plus other resources online, , haven't been able apply of answers own situation. ideally i'd want like this, frequency replaced channel , using own data rather generating something.


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