<unk>  (RCSA) is the difference between the<unk><unk><unk>  (CSA) of aligned and non-aligned molecules. It is normally three orders of magnitude smaller than the static CSA, with values on the order of parts-per-billion (ppb). RCSA is useful for structural determination and it is among the new developments in NMR spectroscopy.
Residual chemical shift anisotropy
Extraction ratio
Anion gap
Blood–gas partition coefficient
Oxygen enhancement ratio
Peak kilovoltage
Lactate threshold
Respiratory quotient