An equation for determining methane densities in fluid inclusions with Raman shifts

where ρ represents the density of methane in g/cm3; D(cm-1) is the difference between the measured peak position of methane in the fluid inclusion (vd) and the known peak position of methane at quite low density (vo). The equation will work regardless of which machine the measurements of Raman shifts are done on, as long as the user knows or finds the zero-density peak position.