Example of spatially overlapping objects: a z = 3.09 Lyα emitter (ID#71) with a z = 0.83 [OII] emitter (ID#72). The HST images in F606W and F814W filters are shown at the top left, the MUSE Lyα and [O ii] images at the top right. The one arcsec radius red circles show the object location derived from the HST image. At the bottom left, the full spectrum (in blue), smoothed with a 4 Å boxcar, and its 3σ error (in grey) are displayed. A zoom of the unsmoothed spectrum, centred around the Lyα and [O ii]3727 emission line, is also shown at the bottom right.