Upper spectra: observed normalized FEROS spectrum at the position HD 144432 B and C (in black), and the normalized synthetic combined model that most closely describes the observed spectrum (in red). Lower spectra: relative contributions of HD 144432 B, C, and the contamination from HD 144432 A (note the difference in the Y-axis for each spectrum). The vertical dotted line displays the absorption line of HD 144432 A used to scale the flux of HD 144432 A to match the observed spectrum. The strength of the contamination from the A component is similar to the flux of HD 144432 B.