Integrated CO intensities fitted with non-LTE models. a) CO emission rotational ladders at fifteen positions throughout the extended envelope. It shows the fits of the CO rotational ladders at the positions of the highest and the lowest T_rot. b) and c) show the CO rotational ladders on Sgr B2(M) b) and Sgr B2(N) c) fitted by the non-LTE model obtained (black line). Blue line represents the contribution from the warm gas, which is distributed throughout the extended envelope. Red line is the contribution of the hot gas associated with the main cores. Grey squares represent the fluxes observed with the SPIRE FTS and the green squares are the fluxes observed with the PACS.