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Figure 3.

Figure 3. Refer to the following caption and surrounding text.

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Main steps of spectrogram preprocessing: (a) default spectrogram on e-CALLISTO website, (b) rebinned and normalized on the same frequency axis for all spectrograms, (c) final resized image without axis labels. All three figures have the same x-axis ranges, covering a 15 min time span, while figures (b) and (c) have the same frequency range (y-axis) from 450 MHz to 50 MHz.

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