New z = 1.15 [OII]3727 emitter found by the algorithm. Top panels, from left to right: white light, HST F₈₁₄, and [OII] narrowband images. The image dimension is 5 × 5 arcsec². Black circle: source location in reference catalog. The bright source at the top is the ID#577 z = 5.8Lyα emitter without a HST counterpart, as already identified in the reference catalog. Red circle: location of a new source. Central panels, from left to right: SELFI max and wavelengths maps (see Sect. 6.4) and [OII] narrowband image derived from the matched filtered data cube. Bottom panels: integrated spectrum, as given by the algorithm. Left: full spectra (smoothed with a Gaussian of 5 pixels FWHM); right: (un-smoothed) zoomed over the [OII] doublet.