Fig. 4.
Panel a: dynamic spectrum with two overlapping groups of intermediate drift bursts. Panel b: amplitude of the corresponding power spectrum as a function of the polar angle on the FT plane. Panel c: same amplitude as a function of drift rate. The two peaks at 6° and 129° correspond to drift rates of 0.132 s−1 (FDB) and −0.012 s−1 (typical fiber group) respectively.
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