A comparison of the fitted UV slope (red continuous line) and best-fit SED of four objects in our sample having best-fit photometric redshift in the range z_phot = 3.5 − 4.1. The observed magnitudes (filled squares and errorbars) are, from left to right: B,V,I,Z,Y,J,H. The linear-fit is performed on I,Z,Y,J. The lower and upper horizontal axes show the observer-frame and the rest-frame wavelengths, respectively.