Comparison of Pal 15 (red boxes, scaled to the respective abundance scatter) with seven GCs at similar metallicities. Left panels: abundance ratios. Right panels: difference [X/Fe]_GC−[X/Fe]_Pal15. To help readability, the figures are split into two panels each. Top panels: three objects at −1.8 dex, and bottom panels: remaining more metal-poor reference GCs. For iron, we show [Fe/H] relative to the Pal 15 mean.