(a) Representation of the $\mathrm{X}_{5}^{+}$direction given by the components $c 1$ et $c 2$ for the $\mathrm{Sr}_{2} \mathrm{MM}^{\prime} \mathrm{O}_{6}$ and (b) their corresponding distortion given by the amplitudes of A10 and A11.
(a) Representation of the \mathrm{X}_{5}^{+}direction given by the components c 1 et c 2 for the \mathrm{Sr}_{2} \mathrm{MM}^{\prime} \mathrm{O}_{6} and (b) their corresponding distortion given by the amplitudes of A10 and A11.