Proper motion values of the known YSO candidates as a function of their distances, obtained from Gaia DR2. The triangles and circles in blue, red, and green represent the d − μ_α⋆ and d − μ_δ values of the sources located toward L1147/1158, L1172/1174, and L1177, respectively. The error ellipses corresponding to three times the MAD (darker shade) and six times the MAD (lighter shade) in proper motion and distance values are drawn. The locations of HD 200775, BD+68°1118, and PV Cep are also marked. The dashed lines show the median values of d, μ_α⋆, and μ_δ.