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Fig. 1

image

Examples of ZPs observed by URAN-2 radio telescope. The dynamic spectra show the total intensities I (see Eq. (1)) of radio emission in dB above the frequency-dependent background noise of the receiver. This background is defined as a time-averaged frequency profile of a broadband noise injected from a reference noise oscillator into the receiving path before and at the end of each observing session.

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