In the source article OP has linked elsewhre in these comments, the author notes that the first image is their own measurement and the second and third are David Chandler’s. I don’t know of Chandler myself but the article is clearly heabily inspired by him. I assume there was some kind of difference in methodology that produced the different values, like one of them was measuring the tape while it was un-tensioned and the other was doing geometry to get the length of the tensioned tape or something