Locations of all the 4FGL sources in the region of Vela, whose contours from a ROSAT observation are shown (Voges et al. 1999). The extended sources are labelled (blue circles), as well as the Vela pulsar. The squares represent the sources that we removed from the model (the sources in Table 1 except for those classified as pulsars) while the green triangles are the sources that were kept in the model (the sources classified as pulsars in Table 1 and those that might be associated with the Vela molecular ridge, i.e., the sources in Table 2). The sources that we kept in the model because they have known associations in the 4FGL catalogue or lie outside our chosen region around Vela (large dashed circle) are represented by magenta + symbols. The dashed red line represents the Galactic plane.