Top: the image stacking of the 46 I₈₁₄-dropout candidates in the UDS field for V₆₀₆, I₈₁₄, J₁₂₅, and H₁₆₀ bands. Middle: the VIJH photometry of this image stacking (black dots) has been fitted with an extended library of synthetic galaxies, and the best fit (blue line) is consistent with a photometric redshift z ≥ 6.5, with no secondary peak at z ~ 1–2. The model templates are computed with the spectral synthesis models BC03 (Bruzual & Charlot 2003), and chosen to broadly encompass the variety of star-formation histories, metallicities and extinction of real galaxies, as described in detail in McLure et al. (2011). At z = 6.5 the Lyman continuum absorption is at an observed wavelength of λ = 6840 Å, and a faint emission in the I₈₁₄ filter can be still compatible with a partially neutral IGM at this redshift. Bottom: the continuous curve is the reduced χ² as a function of photometric redshift z, while the dotted line is the probability P(z) rescaled to have the peak at the same level of χ², to improve visibility.