The porosity, density of solid particles and the specificity also can be generated easily and they are constant. The main difficult ones was capillary potential, because we said that we would require a relation between the capillary potential and q_l. And of course the unsaturated hydraulic conductivity also is a strong function or is a non-linear a strongly non-linear function of q_l, now also the thermal conductivity which has to be determined by experiments. Otherwise the accuracy of analysis will not be good.