$

% \usepackage[usenames,dvipsnames]{pstricks}

% \usepackage{epsfig}

% \usepackage{pst-grad} % For gradients

% \usepackage{pst-plot} % For axes

\scalebox{1} % Change this value to rescale the drawing.

{

\begin{pspicture}(0,-1.2289063)(3.42,1.1889062)

\psframe[linewidth=0.04,dimen=outer](3.42,1.1889062)(0.0,-0.79109377)

\psline[linewidth=0.04cm](1.7,1.1489062)(1.7,-0.75109375)

\psline[linewidth=0.04cm](2.2,1.1489062)(2.2,-0.7710937)

\psline[linewidth=0.04cm](1.22,1.1689062)(1.22,-0.7710937)

\usefont{T1}{ptm}{m}{n}

\rput(2.35125,-1.0010937){x_0}

\end{pspicture}

}

$

$\color{white} E(x) = \tfrac{-e N_d}{\varepsilon } (x+x_0)$

$\color{white} \frac{[coul][cm^3][cm]}{\frac{[coul]}{[V][cm]}} = [V][cm^5]$

Testing 2

$\sum_{i=1}^nx_i$

Testing 1

1