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Context.Averaged pulse profiles of three nearby pulsars: B1929+10, J0437-4715 and B0950+08 exhibit unusual “double notches”. These W-like looking features consist of two adjacent V-shaped dips that approach each other at increasing observation frequency roughly at a rate , where Δ is the separation between the notches' minima.
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Dyks et al. (2007) studied this question.
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