Illustration of the deep near-IR data available over the two GOODS fields. Deep near-IR data are essential for measurements of the UV-continuum slope of galaxies at z 5 and valuable for a measurement of these slopes at z ~ 4. The red and dark red regions correspond to regions with deep and very deep NICMOS J ₁₁₀ and H ₁₆₀ coverage, respectively (5σ depths 26.5 and 28 AB mag). The light orange regions have deep NICMOS H ₁₆₀-band coverage (5σ depths of 26.5; H. Teplitz et al. 2009, in preparation; C. Conselice et al. 2009, in preparation) while the magenta regions have deep NICMOS J ₁₁₀-band coverage (5σ depths of 26.5; R.J. Bouwens et al. 2009, in preparation). The blue and dark blue regions correspond to regions with deep and very deep optical ACS V ₆₀₆ i ₇₇₅ z ₈₅₀ coverage, respectively (5σ depths of 28 and 29 AB mag). For more details on the NICMOS data over the two GOODS fields, see Bouwens et al. (2008) and R. J. Bouwens et al. (2009, in preparation).