Fig. 2
Frequency shift thermal coefficients and intercepts. a \({}^{1}\)H and \({}^{23}\)Na frequency shift thermal coefficients \(\alpha\) (slope of the linear fit) at different NaCl concentrations (in % of weight). b \({}^{1}\)H and \({}^{23}\)Na constants \({\sigma }_{0}\) (intercept of the linear fit) at different NaCl concentrations (in % of weight). c Frequency shift thermal coefficient difference \(\Delta \alpha\) = \(\alpha\)(\({}^{1}{\rm{H}}\))\(-\alpha\)(\({}^{23}{\rm{Na}}\)) calculated from (a), at different NaCl concentrations (in % of weight). d Intercept difference \(\Delta {\sigma }_{0}={\sigma }_{0}\)(\({}^{1}{\rm{H}}\))\(-{\sigma }_{0}\)(\({}^{23}{\rm{Na}}\)) calculated from (b), at different NaCl concentrations (in % of weight).
