S-curves of MT 213

The final S-curves for the x and y orthogonal scans for MT 213. The top panels show the mean residual cross-correlation functions (black line: after removal of the primary component) plus the CCF standard deviations (gray line). The positions of components are indicated by vertical dashed lines. The middle panels show the observed (solid line) and modeled (dashed line) S-curves. The lower panels display the observed minus model residuals (black line) and standard deviation (gray region) plus a fit of the second derivative (gray line) if a close companion is present.