\begin{picture}(0,0)%
\epsfig{file=OCBblocki.pstex}%
\end{picture}%
\setlength{\unitlength}{3355sp}%
%
\begingroup\makeatletter\ifx\SetFigFont\undefined%
\gdef\SetFigFont#1#2#3#4#5{%
  \reset@font\fontsize{#1}{#2pt}%
  \fontfamily{#3}\fontseries{#4}\fontshape{#5}%
  \selectfont}%
\fi\endgroup%
\begin{picture}(4725,1602)(3451,-4273)
\put(5851,-2986){\makebox(0,0)[b]{\smash{\SetFigFont{17}{20.4}{\rmdefault}{\bfdefault}{\updefault}$K$}}}
\put(5851,-4151){\makebox(0,0)[b]{\smash{\SetFigFont{17}{20.4}{\rmdefault}{\bfdefault}{\updefault}$E_K$}}}
\put(4651,-2911){\makebox(0,0)[b]{\smash{\SetFigFont{17}{20.4}{\rmdefault}{\bfdefault}{\updefault}$z_i$}}}
\put(7051,-2911){\makebox(0,0)[b]{\smash{\SetFigFont{17}{20.4}{\rmdefault}{\bfdefault}{\updefault}$z_i$}}}
\put(8176,-4036){\makebox(0,0)[rb]{\smash{\SetFigFont{17}{20.4}{\rmdefault}{\bfdefault}{\updefault}$C_i$}}}
\put(3451,-4036){\makebox(0,0)[lb]{\smash{\SetFigFont{17}{20.4}{\rmdefault}{\bfdefault}{\updefault}$M_i$}}}
\end{picture}