Notes. Median normalized age spreads for kinematic age by traceback to closest approach σ_τ,kin,CA and isochronal age σ_τ,iso according to either Gaia DR3 BP - RP or G - RP color, using Baraffe et al. (2015), Marigo et al. (2017) or Somers et al. (2020) models. These are measured for subsets of likely YSO members of NGC 2264 N, NGC 2264 S and Collinder 95 with the following criteria; all YSOs consistent with being closer to the cluster center in the past and thus having valid traceback parameters, YSOs with closest approach distance CA < rc (inside the core radius), YSOs with closest approach distance CA −1σ < r_c (inside the core radius within 1σ uncertainty).