\documentclass{ppex} \nonstopmode \pagestyle{empty} \setlength\textwidth{135.0pt} \begin{document} \ResetPreambleCommands \ReadyForTheFray \expandafter\ifx\csname graph\endcsname\relax \csname newbox\endcsname\graph\fi \expandafter\ifx\csname graphtemp\endcsname\relax \csname newdimen\endcsname\graphtemp\fi \setbox\graph=\vtop{\vskip 0pt\hbox{% \special{pn 11}% \special{pa 950 738}% \special{pa 650 738}% \special{fp}% \special{ar 500 738 150 150 0 6.28319}% \special{pa 350 738}% \special{pa 50 738}% \special{fp}% \graphtemp=\baselineskip\multiply\graphtemp by 1\divide\graphtemp by 2 \advance\graphtemp by .5ex\advance\graphtemp by 0.738in \rlap{\kern 0.725in\lower\graphtemp\hbox to 0pt{\hss \hbox{$\:$}$-$\hbox{$\:$}\hss}}% \graphtemp=\baselineskip\multiply\graphtemp by 1\divide\graphtemp by 2 \advance\graphtemp by .5ex\advance\graphtemp by 0.888in \rlap{\kern 0.500in\lower\graphtemp\hbox to 0pt{\hss \hbox{$\:$}$v_s$\hbox{$\:$}\hss}}% \graphtemp=\baselineskip\multiply\graphtemp by 1\divide\graphtemp by 2 \advance\graphtemp by .5ex\advance\graphtemp by 0.738in \rlap{\kern 0.275in\lower\graphtemp\hbox to 0pt{\hss \hbox{$\:$}$+$\hbox{$\:$}\hss}}% \special{pa 50 738}% \special{pa 50 538}% \special{pa 0 513}% \special{pa 100 463}% \special{pa 0 413}% \special{pa 100 363}% \special{pa 0 313}% \special{pa 100 263}% \special{pa 50 238}% \special{pa 50 38}% \special{fp}% \graphtemp=.5ex\advance\graphtemp by 0.388in \rlap{\kern 0.000in\lower\graphtemp\hbox to 0pt{\hss \hbox{$\:$}$R$\hbox{$\:$}}}% \special{pa 50 738}% \special{pa 50 571}% \special{fp}% \special{sh 1.000}% \special{pa 25 671}% \special{pa 50 571}% \special{pa 75 671}% \special{pa 25 671}% \special{fp}% \graphtemp=.5ex\advance\graphtemp by 0.621in \rlap{\kern 0.050in\lower\graphtemp\hbox to 0pt{\hss \hbox{$\:$}$i$\hbox{$\:$}}}% \special{pa 50 38}% \special{pa 350 38}% \special{fp}% \special{ar 387 38 37 37 -3.141593 -0.000000}% \special{ar 462 38 38 38 -3.141593 -0.000000}% \special{ar 538 38 37 37 -3.141593 -0.000000}% \special{ar 612 38 38 38 -3.141593 -0.000000}% \special{pa 650 38}% \special{pa 950 38}% \special{fp}% \graphtemp=\baselineskip\multiply\graphtemp by 1\divide\graphtemp by 2 \advance\graphtemp by .5ex\advance\graphtemp by 0.038in \rlap{\kern 0.500in\lower\graphtemp\hbox to 0pt{\hss \hbox{$\:$}$L$\hbox{$\:$}\hss}}% \special{pa 950 38}% \special{pa 950 358}% \special{fp}% \special{pa 875 358}% \special{pa 1025 358}% \special{fp}% \special{ar 950 547 150 150 -2.094395 -1.047198}% \special{pa 950 397}% \special{pa 950 738}% \special{fp}% \graphtemp=.5ex\advance\graphtemp by 0.283in \rlap{\kern 0.950in\lower\graphtemp\hbox to 0pt{\hbox{$\:$}$+$\hbox{$\:$}\hss}}% \graphtemp=.5ex\advance\graphtemp by 0.388in \rlap{\kern 1.025in\lower\graphtemp\hbox to 0pt{\hbox{$\:$}$v_C$\hbox{$\:$}\hss}}% \graphtemp=.5ex\advance\graphtemp by 0.493in \rlap{\kern 0.950in\lower\graphtemp\hbox to 0pt{\hbox{$\:$}$-$\hbox{$\:$}\hss}}% \graphtemp=.5ex\advance\graphtemp by 0.388in \rlap{\kern 0.875in\lower\graphtemp\hbox to 0pt{\hss \hbox{$\:$}$C$\hbox{$\:$}}}% \hbox{\vrule depth0.888in width0pt height 0pt}% \kern 1.025in }% }% \usebox{\graph} \end{document}