Bands indicate the theoretical expected number of sources within distance r and for a given age (left), or with ages younger than t within a given distance (right), for a supernova rate of three explosions per century in the Galaxy. The width of the bands gauges the uncertainty in the number of local sources due to the shot-noise effect. The curves feature the cumulated number of sources in our catalogue. This one appears to be complete for t < 5 × 10⁴y and r < 2kpc.