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Fig. 2.

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Single-pulse sequences for six observing sessions at the LPA (112 MHz) and LOFAR (30−80 MHz) telescopes. The designations for sessions at LPA are given in ddmmyy format. Observations with IDs starting with L were taken at LOFAR. For all sessions, only the on-pulse region is shown, and the colors are saturated to highlight fainter pulses. Mode boundaries were determined based on the average profile morphology and the presence of subpulse drift in 2D FFT spectra (Sect. 4.2.1). Sessions 051112, 150518, L99010, and L102418 feature Q-to-B mode transitions. Session 260520 shows a rare B-Tb-B mode transition, and 221219 exhibits a typical featureless B-to-Q mode switch.

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