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Actually, it looks like Excalidraw[1] to me. The shading and line style match very closely. [1] https://excalidraw.com/

I often see charts produced using matplotlib or plotly - often you can tell based on the colour schemes used. For example, the bar chart at the bottom of this paper looks like it w…

A common alternative solution in this case would be to use an adaptive thresholding technique such as Otsu’s method.