Before revision:  Further, we extend the model, which was previously parameterised to just one salt concentration ([Na + ]=0.5M), so that it can be used for a range of salt concentrations including those corresponding to physiological conditions.
After revision:  Further, we extend the model, which was previously parameterised to just one salt concentration ([Na ^+ ]=0.5M), so that it can be used for a range of salt concentrations including those corresponding to physiological conditions.