Top: Planck spectra at 100, 143 and 217 GHz without subtraction of foregrounds. Middle: SPT spectra from R12 at 95, 150 and 220 GHz, recalibrated to Planck using the best-fit calibration, as discussed in the text. The S12 SPT spectrum at 150 GHz is also shown, but without any calibration correction. This spectrum is discussed in detail in Appendix B, but is not used elsewhere in this paper. Bottom: ACT spectra (weighted averages of the equatorial and southern fields) from D13 at 148 and 220 GHz, and the 148 × 220 GHz cross-spectrum, with no extragalactic foreground corrections, recalibrated to the Planck spectra as discussed in the text. The solid line in each panel shows the best-fit base ΛCDM model from the combined Planck+WP+highL fits listed in Table 5.