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Quick LaTex question: the following code produces a space before "Depth..." in the second row. How on earth do I make it go away?

\begin{table}

\centering

\caption{Possible definitions of critical depth or thickness for traction-exerting cells on 2-D substrates.}

\vspace{0.05 in}

\begin{footnotesize}

\begin{raggedright}

\begin{tabular}{|p{4in} p{2in} |}

\hline \rule{0pt}{3ex}

& Effect of increasing \\

Definition & substrate stiffness \\[3pt]

\hline \rule{0pt}{3ex}

Depth at which a certain strain $\epsilon_{xx}$ exists [Krishnan et al] & Decrease $\left(\propto\!\sqrt{\frac{T}{\mu}}\right)$ \\[3pt]

Coating thickness that attenuates adhesion site displacement by a certain percentage (characterized by $U_1$)& Independent $\left(\propto a\right)$ \\[3pt]

Coating thickness that attenuates adhesion site distortion by a certain percentage (characterized by $U_2$)& Independent $\left(\propto a\right)$ \\[3pt]

Coating thickness that attenuates cell traction force microscopy measurements by a certain percentage & Independent $\left(\propto r\right)$\\[3pt]

Coating thickness that maintains a certain cell behavior & Increase\\[3pt]

\hline

\end{tabular}

\label{table:definitions}

\end{raggedright}

\end{footnotesize}

\end{table}

Thanks for your help.

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# LaTex tabular environment

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