Hist of negative feg
https://git.uni-due.de/sjjabued/ising2d/blob/master/main.cpp#L232 and https://git.uni-due.de/sjjabued/ising2d/blob/master/main.cpp#L342 rounds towards 0 and not -inf!
https://git.uni-due.de/sjjabued/ising2d/blob/master/main.cpp#L232 and https://git.uni-due.de/sjjabued/ising2d/blob/master/main.cpp#L342 rounds towards 0 and not -inf!