\begin{document}$m_H\sim m_{H^\pm}$\end{document} or \begin{document}$m_A\sim m_{H^\pm}$\end{document}, electroweak precision measurements also impose an upper limit on the neutral Higgs masses. In the cases with nonzero singlet mixing with the 2HDM Higgses H or A, we find approximate mass relations of \begin{document}$c^2_{\alpha_{HS}} m_{H} + s^2_{\alpha_{HS}}m_{h_S} = m_{H^\pm}$\end{document} or \begin{document}$c^2_{\alpha_{AS}} m_{A} + s^2_{\alpha_{AS}}m_{A_S} = m_{H^\pm}$\end{document}. These relations are universal to the 2HDM+S models, with or without further symmetry assumption. We also studied the non-alignment limit of the 2HDM+S, which typically has tighter constraints on the masses and mixing angles. Finally, we examined the complementarity between the electroweak precision analyses and the Higgs coupling precision measurements."> Electroweak precision constraints of the 2HDM+S -
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