Correlation plots of PSR J1842+0358. Panel a: Auto-correlation curves of the MP and the IP intensities, which reveal the periodicities in the pulse intensities. The plots are zoomed in to the y-range of −0.2 to 0.4. Panel b: Cross-correlation between the MP and the IP single-pulse intensities and its error bars in black line, and the correlation when reversing the order of the single pulses in grey dashed line. The corresponding correlation of the off-pulse regions is in red. Panel c: Correlation plots computed using the running averaged intensities of the MP and the IP, with the FAST sequence in black, and the MeerKAT sequence in blue, respectively.