The six objects that are catastrophic absolute and relative outliers. The left column shows a smoothed narrow-band image over Ly-α, where the colour coding shows a formal S/N per pixel and goes from − 2 to 3. The subsequent images shows the F775W, F606W, and F435W images with the contours from the Ly-α image overlaid, with the lowest contour at a formal S/N of 2 per pixel. The red cross marks the light-weighted centroid of the narrow-band image within the 1D spectrum extraction mask.