The temperature dependence of the RSMs around the [032 ]* reciprocal lattice point, as seen on the 0kl plane in Fig. 3(a). The first two temperatures, (a) 100 K and (b) 545 K, correspond to the lower-temperature phase; (c) 606 K corresponds to the tetragonal P4bm phase. The white and red dashed lines show the crystallographic * and directions, respectively [as in Fig. 3(a)]. An animated version of this figure is available in the supporting information.