Top panel: temperature power spectra evaluated from downgraded Planck maps, estimated with Commander, NILC, SEVEM, or SMICA, and the 9 year WMAP ILC map, using the Bolpol quadratic estimator. The grey shaded area indicates the 1σ Fisher errors while the solid line shows the PlanckΛCDM best fit model. Bottom panel: power spectrum differences for each algorithm/data set relative to the Commander spectrum, estimated from the spectra shown in the panel above. The black lines show the expected 1σ uncertainty due to (regularization) noise.