@@ -128,19 +128,19 @@ \subsection{The true density matrix}
128128 \fi
129129 }
130130
131- \draw [decorate,decoration=brace]
132- ($ (mu-2 .south east )+(0 ,0 )$ ) --
131+ \draw [<->] % decorate,decoration=brace]
132+ ($ (mu-2 .south)+(0 ,0 )$ ) --
133133 node[below left=6pt] {$ \ncor ^1 _2 ,\color {bad}\ncor ^2 _1 $ }
134- ($ (mu-1 .south west )+(0 ,0 )$ );
135-
136- \draw [decorate,decoration=brace]
137- ($ (mu-3 .south east )+(0 ,-.4 )$ ) --
138- node[below=6pt ] {$ \color {bad}\ncor ^2 _3 \color {black},\color {ok}\ncor ^3 _2 $ }
139- ($ (mu-2 .south west )+(0 ,-.4 )$ );
140- \draw [decorate,decoration=brace ]
141- ($ (mu-3 .south east )+(0 ,-1.2 )$ ) --
142- node[below=6pt ] {$ \ncor ^1 _3 ,\color {ok}\ncor ^3 _1 $ }
143- ($ (mu-1 .south west )+(0 ,-1.2 )$ );
134+ ($ (mu-1 .south)+(0 ,0 )$ );
135+
136+ \draw [<->] % decorate,decoration=brace]
137+ ($ (mu-3 .south)+(0 ,-.4 )$ ) --
138+ node[below=3pt ] {$ \color {bad}\ncor ^2 _3 \color {black},\color {ok}\ncor ^3 _2 $ }
139+ ($ (mu-2 .south)+(0 ,-.4 )$ );
140+ \draw [<-> ]
141+ ($ (mu-3 .south)+(0 ,-1.3 )$ ) --
142+ node[below=4pt ] {$ \ncor ^1 _3 ,\color {ok}\ncor ^3 _1 $ }
143+ ($ (mu-1 .south)+(0 ,-1.3 )$ );
144144
145145 \node at ($ (mu-3 .south east) + (1.5 , -0.5 )$ ) {3 electrodes!};
146146
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