P$.$S$.$ Whitfield et al$.,$ Solid State lonics $181(2010)740$ suggested the following phase

diagram

Fig. $5.$ Composition$/$temperature phase diagram for the succinonitrile:LiTFSI system

heated from $-100C$ constructed from the XRD data.

Top plot phase diagram observed experimentally. Below $2$ plots are obtained by simulations

$($see the chart title$).$ Explain your criteria for identifying the phase transitions in these

simulations.