Maybe someone could help me on a technical detail and the WMAP (the latest "five years" results). On this web site (and several others too), you can find some very nice textures of the CMB from the WMAP study : http://lambda.gsfc.nasa.gov/product/map/current/sos/ Then, they say (read the WMAP 5-Year CMB Map paragraph) that the CMB temperature is 2.725 Kelvins, with a fluctuation (blue and red spots) of 0.0002 Kelvins around the mean value. Well, I'm just wondering about the number of digits here : T = (2.725 ± 0.0002) Kelvins ?? Is it really (2.7250 ± 0.0002) ? If it's really 2.725x, then what about the "x" value ? Here is the complete list of 5 years legacy papers http://lambda.gsfc.nasa.gov/outreach/recent_papers.cfm I can read that the thermal fluctuations are about 200 microKelvins, so +/- 0.0002 K is okay. But what about the mean value ? I want consistency !