This page provides data products associated with the SPT-3G D1 measurement of the CMB TT high ℓ power spectra, as described in Chaubal et al. 2026.

The SPT-3G D1 data set comprises observations from 2019 and 2020 of the SPT-3G Main field, covering the 95, 150, and 220 GHz frequency bands.

The released data include TT band powers spanning the angular multipole range 1700 < ℓ < 11,000, across the six frequency combinations (95x95 GHz, ...)

If you have any questions regarding this data set or its use, please contact Prakrut Chaubal, Nick Huang or Christian Reichardt (prakrutchaubal_at_gmail_dot_com, ndhuang_at_berkeley_dot_edu, christian_dot_reichardt_at_unimelb_dot_edu_dot_au)

For plotting purposes only, we provide a text file whose columns are (index, ell, Dl, sigmaDl) and rows are the bandpowers in order with all 95x95 GHz bandpowers, followed by all 95x150 GHz, 95x220 GHz, 150x150 GHz, 150x220 GHz, 220x220 GHz. Download band powers.

Fig 2: The six auto- and cross-spectra measured with the 95, 150, and 220\,GHz SPT-3G data (black circles) are plotted along with measurements by ACT DR6 (light green, upside-down triangles) and a combination of SPT-SZ and SPTpol (purple pentagons, R21). Note that the plotted ACT bandpowers are array cross spectra and so have multiple points at the same ell for some frequency combinations. We stress that no correction has been made for the different observing bands or point source masking thresholds between the three measurements, which explains the observed differences in the power observed from AGN and dusty galaxies between the three experiments. ACT DR6 masked sources above 15 mJy at 150 GHz, while this work and R21 masked sources above 6 mJy at 150 GHz. The plotted uncertainties are based on the diagonal elements of the covariance matrix, which include noise and sample variance, but not beam or calibration errors. Note that uncertainties for all three datasets have been increased by a factor of ten to be seen more easily.

We provide the likelihood code, data files, and an example python notebook invoking the likelihood with the cobaya sampler in this tarball.