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Fig. 4.

image

Flux density spectrum during the occurrence of the Type IV radio burst at panel a: 10:41 UT, panel b: 10:44 UT, and panel c: 10:49 UT. The NRH flux densities are represented by red circles and are fitted with a power-law function to obtain the spectral index α. The RSTN data are represented by orange triangles fitted by a gyrosynchrotron function. The Phoenix3 data are represented by blue inverted triangles.

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