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Plank covered the entire sky, but due to its smaller mirror, it has lower resolution.

Since they get 24 hours of darkness in the winter, SPT can take very deep images, but they only have access to the circumpolar sky.

In Chile, you can’t image as deeply, but you get access to more of the sky. So South Pole and Chilean telescopes complement each other.

Polarization measurements from SPT-3G are an independent way to determine the Hubble constant. It agrees with Plank measurements and disagrees with the local Universe measurements. The Hubble tension remains.