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Over the last few years the number of high accuracy (uncertainties in the low 10−15 or less) primary frequency standards contributing to TAI has increased significantly from only two over the period 2000 – 2002 to seven over the period 2002 – 2005. As a consequence the number of individual measurements of TAI frequency by such standards over the period 1999 to 2005 is > 60 and increasing rapidly...
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