Constraints in the Ω_m–Ω_Λ plane from the Planck TT+lowP data (samples; colour-coded by the value of H₀) and Planck TT,TE,EE+lowP (solid contours). The geometric degeneracy between Ω_m and Ω_Λ is partially broken because of the effect of lensing on the temperature and polarization power spectra. These limits are improved significantly by the inclusion of the Planck lensing reconstruction (blue contours) and BAO (solid red contours). The red contours tightly constrain the geometry of our Universe to be nearly flat.