Number of sources present in the ECLAIRs field of view and bearing the flag det according to the pointing direction in the sky in Galactic coordinates (longitude increasing from right to left). White pixels correspond to where no position has been drawn. The four maps correspond to the energy bands foreseen for the onboard trigger algorithm. In order to compute the number of sources per sky region, 10 000 pointing positions have been drawn isotropically in the sky, with a roll angle fixed to 0°.