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Fig. 17


For comparison, two consecutive 20-min observations of the 1.88-ms pulsar J0034-0534 at a central observing frequency of 143 MHz and with a spectral resolution of 12 kHz (corresponding time resolution of 82 μs) are shown. The data for the “Incoherent” profile has only been corrected for dispersion by applying a frequency dependent time delay to the spectral channels in the offline post-processing. In contrast, the data for the “Coherent” profile has also been coherently dedispersed online in order to remove the intra-channel dispersive smearing. The increased effective time resolution of the coherently dedispersed data is evident from comparing the two profile morphologies; e.g., two profile components are visible in the “Coherent” profile which are washed out in the “Incoherent” profile. The off-pulse noise has been scaled to the same level to facilitate comparison of the S/N. The effective time resolution is represented by the two horizontal bars on the left-hand side, and reflects the intra-channel smearing in the case of the incoherently dedispersed profile.

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