Estimation of experimental uncertainty

It is reasonable to ask how accurately the mass sensitivity in vacuum reflects the sensitivity when the device has liquid contacting the surface. This was investigated by monitoring the frequency shift of a single device both during vacuum deposition of a metal film and removal of the same film in an etching solution. The sensitivity in the liquid was approximately 6% less than the value measured in vacuum, a discrepancy that lies within our estimates of experimental uncertainty in this case [54]. 

The figures in parentheses are the authors estimates of experimental uncertainty. H hyperfine structure not resolved. 

Authors estimate of experimental uncertainty, in units of the last quoted decimal place. 

The figures in parentheses represent the authors estimate of experimental uncertainty in [kHz]. 

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