Spatial distribution of Gaia sources (green star symbols) in the Serpens South and W40 regions. The arrows indicate their proper motions. The red star and red arrow mark the location of the water maser associated with CARMA–6 and the proper motion from the astrometric fits. The cyan arrows indicate proper motions of stars in W40 that have VLBA astrometric solutions (Ortiz-León et al. 2015). We subtracted the expected proper motion of the Serpens South and W40 regions due to Galactic rotation from the proper motions shown here. The background shows the H₂ column density map obtained with Herschel (André et al. 2010).