[Python] How do I display drop shadows for line charts with Matplotlib?

I am trying to make a drop shadow for some data I have. View the current image here

I can't increase the drop shadow's width. Is there a way to do it?

Here's what I currently have:

plt.plot(times, past_values,color='red',path_effects=[path_effects.SimpleLineShadow(shadow_color="red"),path_effects.Normal()])

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