% Editable vector line art. Risk levels copied from the certified main text.
% Coordinates are display layout, not a new calculation or numerical search.
\begin{tikzpicture}[font=\footnotesize,>=stealth,line cap=round]
 \definecolor{povmblue}{HTML}{0072B2}
 \definecolor{pvmorange}{HTML}{D55E00}
 \path[use as bounding box] (-.15,-.5) rectangle (8.45,3.85);
 \node[anchor=west] at (-.1,3.62) {\textbf{(a)} NH-equality effects};
 \begin{scope}[shift={(.42,.16)},x=1.2cm,y=1.2cm]
  \fill[gray!15] (0,0) -- (1.8,.8) -- (1.8,2.05) -- (0,2.05) -- cycle;
  \draw[->,gray] (0,0) -- (1.95,0) node[below,black] {\(E_{33}\)};
  \draw[->,gray] (0,0) -- (0,2.2) node[left,black] {\(E_{22}\)};
  \draw[gray!70,densely dotted] (1,.444) -- (1,1) -- (0,1);
  \draw[gray] (1,0) -- (1,.05);
  \node[below] at (1,0) {\(1\)};
  \node[left] at (0,1) {\(1\)};
  \draw[povmblue,line width=1.3pt] (0,0) -- (1.8,.8)
   node[pos=.6,below,sloped,inner sep=2pt] {\(9E_{22}=4E_{33}\)};
  \draw[->,line width=.8pt] (.45,.2) -- ++(-.223,.502)
   node[anchor=south west,inner sep=1pt] {\(W\)};
  \draw[gray] (.45,.2) ++(.0985,.0438) -- ++(-.0438,.0985) -- ++(-.0985,-.0438);
  \draw[fill=white] (.92,1) -- (1,1.08) -- (1.08,1) -- (1,.92) -- cycle;
  \node[anchor=west] at (1.08,1.02) {\(I_4\)};
  \node[anchor=west] at (.06,1.72) {\(\mathrm{Tr}\,WE>0\)};
 \end{scope}
 \node[anchor=west] at (3.95,3.62) {\textbf{(b)} Bayes risk \(\mathcal L\)};
 \begin{scope}[shift={(4.98,.14)}]
  \def\ys#1{(#1-94.22)*8.4}
  \draw[->,gray] (0,0) -- (0,3.0);
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  \foreach \v/\l in {94.25/94.25,94.40/94.40,94.55/94.55}
   \draw[gray] (-.04,{\ys{\v}}) -- (.04,{\ys{\v}})
    node[left=2pt,black] {\(\l\)};
  \draw[gray!85,densely dashed,line width=.9pt]
   (.08,{\ys{94.2499985}}) -- (2.95,{\ys{94.2499985}});
  \node[anchor=north west,inner sep=1pt] at (.18,{\ys{94.2499985}-.04})
   {NH bound};
  \draw[povmblue,line width=1.3pt]
   (.08,{\ys{94.2859248}}) -- (2.95,{\ys{94.2859248}});
  \node[anchor=south west,povmblue,inner sep=1pt]
   at (.08,{\ys{94.2859248}+.05}) {POVM: 7 outcomes};
  \draw[pvmorange,line width=1.3pt]
   (.08,{\ys{94.5557442}}) -- (2.95,{\ys{94.5557442}});
  \node[anchor=north west,pvmorange,inner sep=1pt]
   at (.08,{\ys{94.5557442}-.06}) {PVM: 4 outcomes};
  \draw[<->,line width=.6pt] (3.15,{\ys{94.2859248}+.03})
   -- (3.15,{\ys{94.5557442}-.03})
   node[midway,left,inner sep=2pt] {\(\approx0.270\)};
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   -- (3.15,{\ys{94.2859248}-.02});
  \node[anchor=north east,inner sep=1pt] at (3.3,{\ys{94.2499985}-.04})
   {\(\Gamma_k\approx0.036\)};
 \end{scope}
\end{tikzpicture}