Right. I recall from Riess's et al 2004 paper that they specifically were not drawing any conclusions that were outside the range of their data. But their most distant Ia supernovae showed the expansion prior to ~6 billion years ago was decelerating. Since such supernovae were brighter than expected, this also ruled out any "tired light" models as well as a concern over a hypothetical "gray dust" that could have been affecting the earlier observations of dimmer-than-expected supernovae around z=.5 that indicates the dark energy then takes over from gravitation and begins to accelerate the expansion.

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