\begin{document}$M_{\rm max}$\end{document} and its corresponding radius \begin{document}$R_{M\rm max}$\end{document} can also be expressed linearly by a combination of radial central pressure \begin{document}$p_{\rm rc}$\end{document} and central energy density \begin{document}$ \varepsilon_{c} $\end{document}, which is insensitive to the equation of state (EOS). We also found that the obtained central EOS would change with different values of \begin{document}$\lambda_{\rm BL}$\end{document} (\begin{document}$ \lambda_{H} $\end{document}), which controls the magnitude of the difference between the transverse pressure and radial pressure. Combining with observational data of PSR J0740+6620 and comparing to the extracted EOS based on an isotropic neutron star, it is shown that in the BL model, for \begin{document}$\lambda_{\rm BL}$\end{document} = 0.4, the extracted central energy density \begin{document}$ \varepsilon_{c} $\end{document} changed from 546 − 1056 MeV/fm3 to 510 − 1005 MeV/fm3, and the extracted radial central pressure \begin{document}$p_{\rm rc}$\end{document} changed from 87 − 310 MeV/fm3 to 76 − 271 MeV/fm3. For \begin{document}$\lambda_{\rm BL}$\end{document} = 2, the extracted \begin{document}$ \varepsilon_{c} $\end{document} and \begin{document}$p_{\rm rc}$\end{document} changed to 412 − 822 MeV/fm3 and 50 − 165 MeV/fm3, respectively. In the H model, for \begin{document}$ \lambda_{H} $\end{document} = 0.4, the extracted \begin{document}$ \varepsilon_{c} $\end{document} changed to 626 − 1164 MeV/fm3, and the extracted \begin{document}$p_{\rm rc}$\end{document} changed to 104 − 409 MeV/fm3. For \begin{document}$ \lambda_{H} $\end{document} = 2, the extracted \begin{document}$ \varepsilon_{c} $\end{document} decreased to 894 − 995 MeV/fm3, and the extracted \begin{document}$p_{\rm rc}$\end{document} changed to 220 − 301 MeV/fm3."> Anisotropic pressure effect on central EOS of PSR J0740+6620 in the light of dimensionless TOV equation -
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