Example of sources where spectral extraction gives different results. Three different extraction schemes are shown for the Lyα emitters MID-106 (a) and MID-7295 (b). For each subfigure we show the full spectrum (lower left panel) and a zoomed region around the Lyα line (lower right panel). In green we display the spectrum derived from the weighted extraction using the narrowband Lyα weighted map (NBEXT) and its segmentation (top left panel), in red the ORIGIN weighted extraction (top central panel) and in blue the ODHIN extraction based on the R15 segmentation map (upper right panel). The colored area in the left and central top panels indicate the source (orange) and masked objects (magenta) segmentation maps. In the case of the low S/N source MID-7295 (b), the spectra have been smoothed with a 5 pixels width kernel and a Gaussian filter of 0.4 arcsec FWHM has been applied to the Lyα narrowband image (top left panel of subfigure b). Observed wavelengths are in Å units.