R_CO vs. luminosity. The black line is the measured extent from the simulation without any history, with the shaded area giving the one-sigma uncertainty. The black dashed line is the measured extent including luminosity history. The red points are the observations from Jørgensen et al. (2015). The blue line is the predicted extent given by Eq. (4). The dotted lines show the 15 kλ and 50 kλ baseline limits, assuming a source distance of 235 pc.