Fig. A.1.

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Spectra obtained during observations at UTR-2 radio telescope in the scanning mode relative to DecJ = 0°. Red line – signal from North – South antenna; Blue line – signal from West – East antenna. Upper - Spectrum obtained on January 22, 2022 at 00:34:05 (UTC; culmination time for NGC 3521); Lower - Spectrum obtained on January 22, 2022 at 11:00:00 (UTC).
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