Proper motions for OB-type and supergiant stars of Masgomas-1. Grey circles indicate the proper motions for stars without spectral follow-up (unidentified cluster members, foreground and background stars), and black numbers show the proper motion for cluster massive stars, classified spectroscopically. Red numbers indicate the proper motion for foreground stars, derived from the spectroscopic observations. In the bottom right corner of the figure we show the mean error for the proper motions ( and ). Ellipses represent 1σ and 2σ proper motion uncertainties.