I love this experiment, Jens! 😀 I am only a bit skeptical about your entropy production definition, in particular for relatively large systems/small baths (e.g. Fig. 2b). 😉 Have you checked to correctly take into account finite size effects of the bath?

Am I supposed to understand this??? 😂

Sometimes I am more afraid of long supplemental material than long main paper... 🤣

When I was a kid, we went every year for weeks on the frozen lakes around Berlin to play... Nowadays, the ice would even hold a cockroach...