Where does the approximately 1-point vertical white space between subsequent figure rows come from? You may see it in my MWE only if you zoom in between the rows. I have tried a couple of things to get rid of it, yet only \vspace*{-1pt} seems to help. However, I found this quite symptomatic, and I am not even sure 1pt is the correct length.

    Which \textit{vertical} space is this between the graphics?



    It's here as well:



    How do I remove it exactly?

Note: This may be a duplicate of https://stackoverflow.com/questions/3811207/insert-images-with-no-vertical-distance-in-la-tex, yet this one did not receive a satisfactory answer.



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