Radial elemental gradients [El/H] as a function of R_GC. The blue lines are linear regression model fits, the translucent bands around the regression lines describe a 95% bootstrap confidence interval, and the cyan curves are the lowess models. Each panel is colour-coded according to the nucleosynthesis channel (red: α and odd-Z elements; light cyan: iron-peak elements; cyan: s-process elements; dark cyan: r-process elements).