Synthetic maps of gamma-ray flux, considering 50 h of observation with CTA and E_γ ≥ 1 TeV. Top and middle panels: gamma-ray flux of CMZ models without differential diffusion and polar advection, reported in Paper I. Bottom panel: gamma-ray flux of CMZ model with differential diffusion and polar advection. CR sources and the CMZ morphology are indicated on each panel. White, yellow, cyan and green contours are lower limits to N_γ, σ, SBGR and S/N, respectively. All maps have been smoothed with a 0.03° Gaussian function to adopt the CTA beamwidth.