Intensity spectra of HD 156324 around He i 4471 Å and Mg ii 4481 Å of the first, second, and third (top to bottom) observations. The combined synthetic spectra of the triple system are over plotted in each panel with full dark grey lines. The contributions of the three components relative to the combined stellar flux of the system are over plotted in dot-dashed light-grey lines.The position of the strongest lines of the primary (P), secondary (S), and tertiary (T) components are indicated with vertical bars.