17 Sept 2001: two-harmonic type II bursts

1st usual burst (F1, H1):  df/dt ~ -0.135 MHz/s

2nd fast-drifting burst (F2, H2): df/dt ~ -0.6 MHz/s

[ For 2xNewkirk density model:    1st burst -- 1350 km/s;    2nd burst -- 9700 km/s ]

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