Spectral fitting of the La II and Ce II lines is shown for HD 198269 in the lower panel. Spectral synthesis of Nd II and Hf II is shown for HD 224959 in the upper panel. Red curves correspond to spectral syntheses with the adopted abundances for these elements, as listed in Table B.2. The blue and green curves correspond to syntheses with abundances deviating by ±0.3 dex from the adopted abundance. The black dashed line represents the observed spectrum. The magenta line corresponds to the synthesis with a null abundance for the corresponding element.