Observed spectrum of MML 53 and model spectra of all three stellar components. This figure illustrates the agreement between the observed spectrum of MML 53 (black solid line and gray underlying area) and synthetic model spectra (green) for each of the three stars in the system. Top panel: spectrum as observed on 18 August 2009, when the absorption lines of this triple-lined spectroscopic system were well separated. Bottom three panels: disentangled spectra of each individual stellar component. The synthetic spectrum in the top panel is a luminosity-weighted combination of the synthetic spectra shown in the lower panels, taking into account the radial velocity offset of each component.