Claims of US election fraud: the steady difference between in-person and mail-in vote shares.
A more interesting — and thus far not debunked — analysis concerns the difference between mail-in and in-person votes in Pennsylvania. Apart form Philadelphia, it is remarkably consistent — around 40%. This is the image in question — doing the rounds on Trump-supporting websites.
I have checked some of the data points at random, and they seem to be accurate. I do not have an explanation for this at the moment.