highlight ppdot
The period-period derivative diagram (data from ATNF pulsar database), shown for a sample consisting of radio pulsars (small dots), high-energy pulsars (HE, red dots), anomalous X-ray pulsars (AXPs, open circles), rotating radio transients (RRATs, pink dots), and thermally emitting isolated neutron stars (XINSs, filled circles, including RXJ0720). Lines of constant characteristic age tau, magnetic field B and spin-down luminosity E-dot are also shown. RXJ0720 is highlighted by the black square for values reported in the literature and by the green filled square according to our paper (A&A 2017, 601, A108).

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