Выражение встречается в следующем контексте: In the European Journal of Anaesthesiology's June 2006 Abstracts and Programme, held in Madrid, Spain, a paper by R.E.Anderson. et.al., researchers from the Karolinska University Hospital and Sebbalsberg Hospital reported on comparisons of the new *** device and a Cardiocap (sidestream) monitor (from GE/Datex Medical) using a washout technique employing a larynx mask, had R2 values of 0.994 for nitrous oxide and 0.967 for sevoflurane.

Заранее спасибо