Luminosity function for stars with a membership probability greater than 0.95 of young open clusters and Sco OB2 in the ScoCMa stream, ordered by increasing age. The black line is the theoretical luminosity function from PARSEC, at the same age as the cluster’s isochrone age. The bin size is 0.25 mag. A vertical scaling factor of 3 is applied to fit with the observational profiles. The blue line is the observed LF made by KDE. The kernel bandwidths are labeled “bw” in the insets. The PARSEC LFs show the H-peak at M_G 2 ∼ 6 mag and the Wielen dip at ∼7 mag; the observed LFs show the H-peak, while the Wielen dip is sometimes smoothed out by the KDE procedure (compare the LF of LCC and Collinder 135). For reference, the black vertical dashed line indicates M_G = 7 mag, the position of the Wielen dip. The blue vertical dot-dashed line gives the H-peak position in the observed LF. The red solid line indicates the faint end observational limit of Gaia DR2 at the cluster’s distance, and the red dashed line represents the completeness limit at the bright end of Gaia DR2. All LF features of interest in this work are within the completeness limit.