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Testing robins with radio frequency fields of 7 MHz, 470 nT, added in different alignments with respect to the vector of the local geomagnetic field. (a) Control: geomagnetic field only; (b) radio frequency field added parallel to the magnetic vector, that is 24° to the downward direction; (c) added vertically, 24° to the magnetic vector; (d) added 48° to the magnetic vector, which means 24° to the downward direction—Symbols as in Figure 1b (data from [44]).
