Evolution of the spin period of a spinning-down NS with constant baryon mass Mb = 2.325 M⊙ (black lines) and Mb = 2.3 M⊙ (blue lines), in relation to Fig. 4. The time unit is normalized by the value of the magnetic dipole moment μB = BR3 = 1030 [cgs], which corresponds to a magnetic field of B = 1012 G and a stellar radius of R = 10 km. The lines after the mini-collapse related to a sudden spin-up and marked with red arrows are denoted according to the assumption that the B field stayed unchanged (solid lines), decreased twice (to B = 5 × 1011 G, dashed lines), or decreased by one order of magnitude (to B = 1011 G, dash-dotted lines). Dotted lines mark the evolution of a system with a purely quadrupolar magnetic field of B = 1012 G, emulating a drastic change of the field structure after the mini-collapse.
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