... expansion

Based on observations made with the Nordic Optical Telescope, operated on the island of La Palma, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias, and on observations done at the Centro Astronómico Hispano Alemán (CAHA) at Calar alto, operated jointly by the Max-Planck Institut für Astronomie and the Instituto de Astrofísica de Andalucía (CSIC).

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...)=0.042

See Sollerman et al. (2006) for a discussion on possible uncertainties and biases affecting this measurement.

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