Marginalised 1σ errors on cosmological parameters (from the Fisher matrix for an indicative code), relative to their corresponding fiducial value for a flat (upper panels) and non-flat (lower panels) spatial geometry, in ΛCDM. Left (right) panels: pessimistic (optimistic) settings, as described in the text. Each histogram refers to different observational probes. For both a spatially flat and a spatially non-flat cosmology, we show results for GC_s, WL, GC_s+WL, GC_s+WL+GC_ph, and GC_s+WL+GC_ph+XC.