Comparison among the J-spectra and the GMOS spectra of two galaxies belonging to the cluster. Colour points represent the J-spectra. Grey lines represent the GMOS spectra. The black band shows the magnitudes of the mean model ± one σ uncertainty level. The difference between the model and the mean model fitted magnitudes are plotted as a small coloured points around the black bottom line. Vertical, black dashed lines show the wavelengths corresponding to [OIII] and Hα emission lines.