[texworks] question

[Ovi Chitayat]

 I have the following LaTex code

\documentclass{book} 

\usepackage{tikz} 

\begin{document}

\begin{figure}

\centering

\begin{tikzpicture}

\draw (-3,0)--(3,0) node [below] {\scriptsize $\Omega$} ;

\draw (0,0) node[below]{0} node [below=3mm]{(a)}--(0,3) node[right]{\scriptsize $X_s(j\Omega)$};

\draw [-latex](2,0) node [below, rotate=-90] {\scriptsize $16000\pi$} --(2,1.5) node [right]{$\frac{\pi}{T}$};

\end{tikzpicture}

\end{figure}
\end{document}
This code places a vertical label to the left of a line but the code is trying to have the label show up directly below the line.How do I get the label to print directly under the line?
Ovi
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