Cosmic standard deviation (σ_cosmic) of r-process element abundances across the stellar sample. Left: light r-process elements (normalized to Zr; shown as circles). Right: heavy r-process elements (normalized to Eu; shown as triangles). Only elements measured in at least three stars are included. Marker colors indicate the average number of spectral lines used for the abundance determination. The red horizontal line marks the standard deviation of [Zr/Eu], illustrating the overall variation between the light and heavy r-process components.