Four sets of published data are used: frequency dependence of the day-side horizontal magnetic amplification, the same for the dark-side vertical decrease, the day-side transient amplification and the dark-side transient decrease. Transient data are transformed into the frequency domain and the dark-side data are transformed into the corresponding day-side horizontal amplification. Finally, all experimental results are presented in the form of the day-side frequency response. The summarised apparent resistivity curve is obtained by this response. It corresponds to the model with resistivity about several hundreds of × m to the depths of 700–800 km. It suggests the absence of significant amounts of molten material to these depths.