Fig. (1) Lattice parameters a and c of La_2-2xSr_1+2xMn₂O₇ (x = 0.33 and 0.4) versus temperature T in (a) and (b). In order to compare directly structural and magnetic properties, temperature dependent magnetization in H=100 Oe is plotted in (c). The anomalous change of lattice parameters corresponds to ferromagnetic transition temperature.