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Regions allowed by the $T$-parameter at 99\% level (a) and unitarity (b) for the $(v,0,0)$ vacuum in the $m_{H_1} = m_{A_1}$ \textit{vs.} $m_{H_2} = m_{A_2}$ \textit{vs.} $m_{H_1^\pm} = m_{H_2^\pm}$ space. The 4th free parameter, the mass of the SM-like Higgs $m_h$, is set to 125.25~GeV. On the left panel we additionally assume that all masses are larger than $m_h$ while on the right one that they are larger than 1 GeV.

Regions allowed by the $T$-parameter at 99\% level (a) and unitarity (b) for the $(v,0,0)$ vacuum in the $m_{H_1} = m_{A_1}$ \textit{vs.} $m_{H_2} = m_{A_2}$ \textit{vs.} $m_{H_1^\pm} = m_{H_2^\pm}$ space. The 4th free parameter, the mass of the SM-like Higgs $m_h$, is set to 125.25~GeV. On the left panel we additionally assume that all masses are larger than $m_h$ while on the right one that they are larger than 1 GeV.

Regions allowed by the $T$-parameter at 99\% level (a) and unitarity (b) for the $(v,v,v)$ vacuum in the $m_{H_1} = m_{H_2}$ \textit{vs.} $m_{A_1} = m_{A_2}$ \textit{vs.} $m_{H_1^\pm} = m_{H_2^\pm}$ space. The 4th free parameter, the mass of the SM-like Higgs $m_h$, is set to 125.25~GeV. On the left panel we additionally assume that all masses are larger than $m_h$ while on the right one that they are larger than 1 GeV.

: unitarity

Regions allowed by the $T$-parameter at 99\% level (a) and unitarity (b) for the $(v,v,v)$ vacuum in the $m_{H_1} = m_{H_2}$ \textit{vs.} $m_{A_1} = m_{A_2}$ \textit{vs.} $m_{H_1^\pm} = m_{H_2^\pm}$ space. The 4th free parameter, the mass of the SM-like Higgs $m_h$, is set to 125.25~GeV. On the left panel we additionally assume that all masses are larger than $m_h$ while on the right one that they are larger than 1 GeV.

: T

Regions allowed by the $T$-parameter at 99\% level (a) and unitarity (b) for the $(\omega v,v,v)$ vacuum in the $m_{H_1} = m_{H_2}$ \textit{vs.} $m_{H_3} = m_{H_4}$ \textit{vs.} $m_{H_1^\pm} = m_{H_2^\pm}$ space. The 4th free parameter, the mass of the SM-like Higgs $m_h$, is set to 125.25~GeV. On the left panel we additionally assume that all masses are larger than $m_h$ while on the right one that they are larger than 1 GeV.

: unitarity

Regions allowed by the $T$-parameter at 99\% level (a) and unitarity (b) for the $(\omega v,v,v)$ vacuum in the $m_{H_1} = m_{H_2}$ \textit{vs.} $m_{H_3} = m_{H_4}$ \textit{vs.} $m_{H_1^\pm} = m_{H_2^\pm}$ space. The 4th free parameter, the mass of the SM-like Higgs $m_h$, is set to 125.25~GeV. On the left panel we additionally assume that all masses are larger than $m_h$ while on the right one that they are larger than 1 GeV.