Top: Ca II absorption line for θ¹ Ori C (solid black line, lower panel). The solid red lines represent the fitted Voigt profiles, obtained with VoigtFit (Krogager 2018) from R-H+25. The blue ticks represent the velocity-space positions of each individual component, grouped as indicated by the vertical blue lines. The values for [Zn/Fe]_fit,i given in Table 1 correspond to the absorption groups in these figures as numbered from left to right in blue. The 1σ residuals are plotted with the black line in the upper panel of this figure, with ± 3σ marked by the dotted horizontal lines. Bottom: Dust extinction density curve in log space for the same target. The vertical dotted pink lines show the locations of the extinction density peaks. The vertical dashed black line represents the location of the star, with the uncertainties represented by the shaded region. The blue numbers correspond to the respective absorption components, as determined by our method for matching absorption components with peaks in dust extinction density (see Sect. 3).