The heat exchanger comprises a heat exchanger body defining an exit plenum chamber shaped for uniform flow of a hot primary heat transfer fluid through the chamber. The machine then selectively recovers documents from storage and dispenses them to other users. A processor records appropriate data points corresponding to the signals, converts them to a logarithmic function of time scale, and plots the converted data points. The low-power extension carrier may be activated as needed to offload data transfers from the primary cell, in download-only, upload-only, and time-division LTE modes. The device comprises: a first device for generation of a first magnetic field, a second device for generation of a second magnetic field and a support with an upper side and a lower side, whereby the support is embodied for applying the treated body regions of the patient thereto.