Example of the deblending procedure applied to two unresolved sources spaced by  ~6 pixels. In panels 1–5 we show the pixels whose photon density is above a threshold that increases at each step. Bridge pixels (see text for the definition) are marked with green boxes and are identified backwards starting from panel 4 to 1. Panel 6 shows the two sources identified separately, with the bridge pixels re-assigned according to a local criterion.