Dynamical systematics in eight time-delay lenses can shift H0 by more than the 2% target, so velocity dispersions must be controlled to about 1% accuracy.
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Dynamical Systematics for Time Delay Lenses and the Impact on the Hubble Constant
Dynamical systematics in eight time-delay lenses can shift H0 by more than the 2% target, so velocity dispersions must be controlled to about 1% accuracy.