CMB-only power spectra measured by Planck (blue), ACT (orange), and SPT (green). The best-fit PlanckTT+lowP  ΛCDM model is shown by the grey solid line. ACT data at ℓ> 1000 and SPT data at ℓ> 2000 are marginalized CMB band-powers from multi-frequency spectra presented in Das et al. (2014) and George et al. (2015) as extracted in this work. Lower multipole ACT (500 <ℓ< 1000) and SPT (650 <ℓ< 3000) CMB power extracted by Calabrese et al. (2013) from multi-frequency spectra presented in Das et al. (2014) and Story et al. (2013) are also shown. The binned values in the range 3000 <ℓ< 4000 appear higher than the unbinned best-fit line because of the binning (this is numerically confirmed by the residual plot in Planck Collaboration XIII 2016, Fig. 9).