Accretion-to-stellar luminosity ratio versus effective temperature, color-coded by standard deviation (σ) from the L_acc/L_⋆−T_eff boundary. The gray line represents the threshold where chromospheric emission is expected to dominate over accretion-related Hα emission (C. F. Manara et al. 2017a). The sample of nonaccreting pre-main-sequence stars from C. F. Manara et al. (2017a) is limited to T_eff of less than 5800 K; therefore, we represent the region outside this limit as a gray dashed line. Black open circles represent objects below or consistent with this boundary at the <1σ level.