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Fig. 15


A sample of average profiles of five pulsars observed with the LBAs using a total of 48 MHz with a channel bandwidth of 12.2 kHz and sampled at a rate of 1.3 ms. In all cases 17 stations were combined incoherently and the observation duration was 2 h, except for PSR B1919+21 which was observed for 1 h. The lower 8 profiles correspond to observations with 6 MHz of bandwidth centered at frequencies, from lowest to highest, of 35, 41, 47, 53, 59, 65, 71 and 77 MHz respectively. The top profile shows the summed profile from all 8 bands. At present there is no flux calibration for the LOFAR data hence no flux density scale is shown and profiles have been normalised to the peak intensity. The bar on the left hand side indicates the smearing due to dispersion across the 12.2 kHz channels and is shown only when it exceeds 3 ms. The periods are given in seconds and the dispersion measure in pc cm-3.

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