Fig. 2.
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dX component of the celestial pole offsets after removing the free core nutation. Panel (a): CPO series referring to the reference model IAU 2006/2000A precession-nutation. Panel (b): CPO series with respect to the IAU 2006J2 precession plus IAU 2000A nutation (dXIAUJ2). The orange and green curves are fitted with Eq. (3; see Sect. 4.2 for more details).
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