Plan view of a simulation of the Galactic maser distribution for maser bearing stars around the spiral structure using the model developed by Quiroga-Nuñez et al. (2017). The spiral structure estimated by Reid et al. (2014) was populated with artificial sources to compare the phase-space density distribution of the spiral arms with S 269 properties (see Sect. 4.3). The Galactic center is located at (0,0), and the yellow and black stars correspond to the position of the Sun (Reid et al. 2014) and S 269, respectively, where their positional error bars are smaller than the size of the marker.