Cumulative surface number density of galaxies. Shown is the surface number density per unit angular area at redshifts greater than z, for magnitude limits m_F277W​ < ​28.5, 29.5, and 31.5 in the three panels, respectively. The FFB predictions are for ϵ_max​ = ​1.0 (blue) and 0.2 (orange), with (solid) or without (dashed) dust correction. They are well above the standard UM predictions (gray). JWST observations are shown in the left and middle panels (gray shaded area), referring to the 68% confidence interval for z​ > ​8.5 galaxies from CEERS (Finkelstein et al. 2023a) and NGDEEP (Leung et al. 2023) respectively. The horizontal dotted line indicates the surface density corresponding to one galaxy per JWST NIRCam field of view (9.7arcmin²). The tentative comparison indicates a fit with ϵ_max​ = ​0.2 − 1. Future JWST observations (e.g., DESTINY proposed for Cycle 3) can possibly reach down to m_F277W​ ∼ ​31.5.