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Fig. 2

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Top: projected Redshift-EW(Lyα) solutions of the SED fitting are shown. Black, blue, and red symbols represent three-,two-, and one-sigma solutions. The well-detected signal in the z850-band is reproducible with a large EW(Lyα) at a higher redshift (z> 7) or very faint Lyα emission at the lower redshift, z< 7. Upper and lower horizontal dotted lines mark the limits provided by the NB973 detection and non-continuum detection below z = 6.6 in the deep spectrum, respectively. The vertical dotted line marks the upper limit of the Lyα rest-frame equivalent width. The transparent gray region underlines the most probable redshift interval. Bottom: SED fitting performed with BC03 libraries with (thin black) and without (blue) nebular emission lines are shown. The fit to the HST bands only is shown with the thick black line. Blue, yellow, and red points represent photometry from HST, VLT (U and K bands), and Spitzer/IRAC, respectively. Upper limits at one sigma are marked with arrows.

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