Figure 11: Left panel: The current sample of all known radio pulsars projected onto the Galactic
plane. The Galactic centre is at the origin and the Sun is at . Note the spiral-arm
structure seen in the distribution which is now required by the electron density model [73, 74]. Right
panel: Cumulative number of pulsars as a function of projected distance from the Sun. The solid line
shows the observed sample while the dotted line shows a model population free from selection effects.
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