“…To obtain the precise transition temperature, we calculated the derivative d𝜒/dT for susceptibility data shown in Figure 2 and used their peak position to define T N (Figure 4a), which has been widely used in previous studies. [41,54,56,59,72] The extracted T N values for the end compounds FePSe 3 , FePS 3 , and MnPSe 3 are 111.1, 120.1, and 73.4 K, respectively, consistent with the reported values. [28,30,43,53,59,64] As shown in Figures 4b and d , both Fe 1−x Mn x PSe 3 and FeP(Se 1−x S x ) 3 samples exhibit similar non-monotonic composition-dependent T N .…”