Figure 5: Top: The allowed range of the parameters , , from the WMAP 3-year
data, is shown as a series of points (reproduced from [145]). The diagonal line shows the locus
corresponding to a flat Universe ( + = 1). An exactly flat Universe corresponds to
H0 70 km s–1 Mpc–1, but lower values are allowed provided the Universe is slightly closed.
Bottom: Analysis reproduced from [154] showing the allowed range of the Hubble constant, in the
form of the Hubble parameter h H0 / 100 km s–1 Mpc–1, and by combination of WMAP
3-year data with acoustic oscillations. A range of H0 is still allowed by these data, although the
allowed region shrinks considerably if we assume that w = –1 or = 0.
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