Fig. 4 | Nature Communications

Fig. 4

From: Measurement of the variation of electron-to-proton mass ratio using ultracold molecules produced from laser-cooled atoms

Fig. 4

Measurement of the temporal variation of μ. The resonance frequencies of the |i〉 − |f〉 transition are plotted for compensated Zeeman shifts. The error bars denote statistical standard deviations of mean. The magenta line shows a linear fit to the data with statistical errors. We obtained the temporal variation of the transition frequency f: \(\frac{1}{f}\frac{{df}}{{dt}} = ( - 0.44 \pm 1.47_{{\mathrm{stat}}} \pm 0.24_{{\mathrm{syst}}}) \times 10^{ - 10}\,{\mathrm{year}}^{ - 1}\)

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