42.6 MHz is the operational frequency of a 1-
Tesla MRT-system, 100 MHz is a common radio broadcast
frequency, 900 MHz and 1.8 GHz are frequencies of GSM
in Europe, 2.45 GHz is a ISM (Industrial Scientific Medical) band and 5.2 GHz is for HiperLAN/2 or IEEE 802.11a. The other frequencies were chosen for interpolation.