Projected spatial distribution of our sample of 63 PSRs onto the Galactic plane. Distance estimates for the PSRs were taken from the ATNF catalogue (Manchester et al. 2005) and are based on the NE2001 Galactic electron-density model (Cordes & Lazio 2002, 2003). Pentagons correspond to K17 data, circles to J18, squares to K21, and triangles to S22. For guidance, the solid black lines show the positions of the spiral arms according to the Hou & Han (2014) model. The central plus symbol marks the position of the Galactic centre, the solar symbol shows the Sun’s position, and dotted lines outline the Galactic quadrants.