High-resolution near-IR H-band spectrum of the extra-tidal star. The spectral regions are shown with orange squares. Superimposed is the best-fit of a MARCS/BACCHUS spectral synthesis (black line). The light blue shaded regions show the strength of the molecules (¹²C¹⁶O, ¹²C¹⁴N, ¹⁶OH), and the atomic lines, namely the α-elements (Mg I, Si I, Ca I, Ti I), the odd-Z elements (Al I, K I), the iron-peak elements (Fe I, Ni I), and the s-process elements (Ce II, ND II, Yb II), expressed in air wavelengths. The legends in each panel show the absolute abundance, A(X), of the species under consideration, and the signal-to-noise (S/N) in the regions of the features, respectively.