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Sandage et al. have used the HST to determine the Cepheid-based distances to IC 4182, the parent galaxy of the Type Ia supernova 1937C, and to NGC 5253, the parent galaxy of the Type Ia supernovae 1972E and 1895B. We compare the spectroscopic and photometric properties of these three calibrator supernovae with the properties of more distant Type Ia supernovae and derive a low value of the Hubble constant.
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