Results from the detection limit simulations converted to hypothetical companion minimum masses (﹩M\mathrm{sin}\,i﹩, top) and minimum astrometric perturbation size of HD 33636 (﹩a_{A}\mathrm{sin}\,i﹩, bottom). The different lines represent the different assumed eccentricity values. Values above the lines would have been detected with a periodogram analysis of the radial velocity data.