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We have studied the single pulse emission from two pulsars, PSR B0844-35 andPSR B1758-29, over a wide frequency range of 300-750 MHz using the uGMRT. Thetwo pulsars have relatively wide profiles with multiple components, that are aresult of the line of sight traversing near center of the emission beam. Inboth pulsars the single pulse sequences show the presence of two distinctemission states, where the profiles become much brighter at the center withprominent core components during one of the modes, while in the other mode thesingle pulses show odd-even subpulse drifting with periodicity around 2$P$, $P$being the rotation period of the pulsar. The centrally bright mode was seen for10 percent of the observing duration in PSR B0844-35, which usually lasted forshort durations of around 10 pulses, but had two longer sequences of around 100pulses. On the contrary the centrally bright mode was dominant in PSR B1758-29and was seen for around 60 percent of the observing duration. PSR B1758-29 alsoshowed period amplitude modulations of 60-70$P$ in both modes. The modechanging in these two pulsars facilitates investigation of the sparking processin the inner acceleration region, dominated by non-dipolar magnetic fields. Thechange in the surface magnetic field configurations likely results in theemission mode change.

Mode changing in PSR B0844-35 and PSR B1758-29 with enhanced emission at the profile centers