I have a very quick and simple question on the phase diagram app. I came across a paper by Prof. Cedar where the phase evolution of Li-Ge-P-S system as function of Li chemical potential is reported, as shown below. On the figure (left), the phase diagram at three chemical potential, 0, -1.8 and -2.5 eV is presented. However, The chemical potential of an open element in the app is given in ranges. I was wondering how the exact potential values were obtained (in the paper) from the ranges given in the app.
Thank you in advance for your help!