Results of the XRPD a) and b) and SXRPD c) and d) data refinements, in the $19-20^{\circ}$ and 5.1$5.3^{\circ} 2 \theta$ interval respectively, in $\mathrm{SrNdCoRuO}{ }_{6}$, using two different models with $P 2_{1} / n$ and $P 4_{2} / n$ space groups. The tetragonal space group has only one reflection in this $2 \theta$ interval, and is unable to take into account the splitting observed in SXRPD; on contrary, the monoclinic space group has three reflections and takes perfectly into account the splitting.
Results of the XRPD a) and b) and SXRPD c) and d) data refinements, in the 19-20^{\circ} and 5.15.3^{\circ} 2 \theta interval respectively, in \mathrm{SrNdCoRuO}{ }_{6}, using two different models with P 2_{1} / n and P 4_{2} / n space groups. The tetragonal space group has only one reflection in this 2 \theta interval, and is unable to take into account the splitting observed in SXRPD; on contrary, the monoclinic space group has three reflections and takes perfectly into account the splitting.