Upper panel: projected separation vs time for HD 106515. Bottom panel: position angle vs time. In both panels filled circles are the measurements kept in the fit and the empty circles are those removed as being outliers in either projected separation or position angle. In both panels, the red continuous line is the linear fit imposing a passage through Hipparcos measurement, the blue dotted line is the quadratic fit, the purple dashed line is the slope as measured from Hipparcos (baseline 3.25 yr; epoch 1991.25) extrapolated to the whole baseline of available data.