'Overlay heatmap on 1D data like ECG signal

I have an ECG signal with shape (1, 5000), like this

and a contribution map with shape (1, 5000), which has values ranging between 0,1.

I want to plot this contribution map as a heatmap on the ECG signal. Currently, I use plt.pcolormesh(contribution) and plot like this

But how can I overlay a heatmap more beautifully like this plot?

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