Data is then read from the data-matrix to perform the reconstruction (there are several steps involved in this but it is not important here). There’s nothing special done on TEA data at this point either compared to other proxies, so the data seems to stay the same way throughout the reconstruction. So, the Tiljander data clearly is not flipped upside-down there. That doesn’t mean the Tiljander data is handled correctly there. Tiljander data is actually handled upside-down there. It is because the data is given in TEA so that higher values of relative X-ray density correspond to lower temperature values, so MEA should have turned the data upside-down before using it in their analysis.