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For a generic vector field robustly without horseshoes, and an aperiodicchain recurrent class with singularities whose saddle values have differentsigns, the extended rescaled Poincar\'e map is associated with a central model.We estimate such central model and show it must have chain recurrent centralsegments over the singularities. This obstructs the application of centralmodel to create horseshoes, and indicates that, differing from $C^1$diffeomorphisms, solo using central model method is insufficient as a strategyto prove weak Palis conjecture for higher dimensional ($\geq 4$) singularflows. Our computation is actually based on simplified way of addressing blowupconstruction. As a byproduct, we are applicable to directly compute theextended rescaled Poincar\'e map upto second order derivatives, which webelieve has its independent interests.

A remark on the central model method for the weak Palis conjecture of higher dimensional singular flows