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Fig. 7

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(J − NB118) vs. (Y − J). The blue and grey dots are objects with and without significant narrow-band excess, respectively. The contours show the density of objects after excluding likely stars. The blue dots additionally marked by a large symbol are line emitters confirmed by spectroscopy, see Fig. 8 for a legend. The solid line is meant to represent the locus of the majority of the objects. The dotted line located 0.2 mag above is one of the selection criteria. The symbols connected by coloured lines represent certain Maraston (2005) model galaxies (see text) without emission lines, placed at the 7 redshifts indicated on the panel and observed at times (from left to right) 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.5, 2.0 and 3.0 Gyr (except for z = 2.2 where 3.0 Gyr is not shown).

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