Fig. 3. Profiles of total porosity calculated from 105°C oven drying (105 porosity) and effective porosity calculated as total porosity minus porosity calculated from elevated relative humidity drying (relative humidity porosity) for core from two boreholes, (a) N31, and (b) SD7. A difference between 105 and relative humidity porosity of >5% is indicated by black bars (adapted from Flint, 2003).