Fig. 4.
Dynamic spectrum of a 15 min observation pointing on PSR B1919+21. Top and bottom panels: provide the linear feed polarization from the NE-SW and NW-SE dipoles corresponding to XX and YY, respectively. These dynamic spectra were recorded with time and frequency resolutions of 0.01 s and 1.5 kHz, and then integrated to 0.04 s and 390 kHz for this display.
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