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. 2015 Dec 7;5:17495. doi: 10.1038/srep17495

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In the left panels each solid circle represent 100 s of averaged data, the light and dark-green regions represent 1 σ standard deviation and standard deviation of the mean, respectively. The offset frequency is the BIPM recommended frequency value¹⁰. The right panels show a histogram of the frequency measurements with fitted Gaussian function.

Inline graphic — In the left panels each solid circle represent 100 s of averaged data, the light and dark-green regions represent 1 σ standard deviation and standard deviation of the mean, respectively. The offset frequency is the BIPM recommended frequency value¹⁰. The right panels show a histogram of the frequency measurements with fitted Gaussian function.