% !Mode:: "TeX:UTF-8"
% !TEX encoding = UTF-8 Unicode

\begin{center}
  \begin{tikzpicture}
    \begin{scope}
      \begin{axis}[
        compat=1.3,
        anchor=south east,
        at={(0,0)},
        axis x line=bottom,axis y line=left,
        xtick={0,1,1.2,2},
        xticklabels={,1,$1+\epsilon$,},
        ytick=\empty,
        every tick label/.append style={font=\scriptsize},
        every axis label/.append style={font=\scriptsize},
        xtick distance=.1cm,
        ymin=0,
        ymax=3,
        enlarge x limits=0.0,
        width=6.4cm,
        height=6.5cm,
        clip=false,]
        \addplot [mark=none,thick] coordinates {
          (0, 0)
          (1, 1.5)
          (1.2, 1.8)
          (2, 1.8)
        };
        \addplot [mark=none,dashed,line width=0.5pt] coordinates {
          (1, 0)
          (1, 3)
        };
        \addplot [mark=none,dashed,lolred,line width=1.5pt] coordinates {
          (1.2, 0)
          (1.2, 3)
        };
        \node [anchor=south west] at (0,4.8cm) {$\textrm{Clip}(\cdot)$};
        \node [anchor=north] at (4.8cm, 0cm) {\footnotesize{ratio}};
        \node [anchor=north] at (0,0) {0};
        \node (caption a) at (xticklabel cs:0.5) {};
      \end{axis}
      \node (tmp) at (0,0) {};
      \node [anchor=north] (a) at ([yshift=-.8cm]caption a|-tmp) {\footnotesize{(a) $A_t>0$}};

      \begin{axis}[
        compat=1.3,
        anchor=south west,
        at={(+3cm,0)},
        axis x line=top,axis y line=left,
        xtick={0,0.8,1,2},
        xticklabels={,$1-\epsilon$,1,},
        ytick=\empty,
        every tick label/.append style={font=\scriptsize},
        every axis label/.append style={font=\scriptsize},
        xtick distance=.1cm,
        ymin=0,
        ymax=3,
        enlarge x limits=0.0,
        width=6.4cm,
        height=6.5cm,
        y dir=reverse,
        clip=false,]
        \addplot [mark=none,thick] coordinates {
          (0, 1.2)
          (0.8, 1.2)
          (1.0, 1.5)
          (1.8, 2.7)
        };
        \addplot [mark=none,dashed,lolred,line width=1.5pt] coordinates {
          (0.8, 0)
          (0.8, 3)
        };
        \addplot [mark=none,dashed,line width=0.5pt] coordinates {
          (1, 0)
          (1, 3)
        };
        \node [anchor=south west] at (0,-5.4cm) {$\textrm{Clip}(\cdot)$};
        \node [anchor=south] at (4.8cm, 0) {\footnotesize{ratio}};
        \node [anchor=south] at (0,0) {0};
        \node (caption b) at (xticklabel cs:0.5) {};
      \end{axis}
      \node [anchor=north] (b) at ([yshift=-.8cm]caption b|-tmp) {\footnotesize{(b) $A_t<0$}};

    \end{scope}
  \end{tikzpicture}
\end{center}
