LaTex tabular environment
Hi folks,
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 tractionexerting cells on 2D 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. 
Just take out \rule{0pt}{3ex} before it.

No doubt, this removes the annoying space. But it also removes a most desirable horizontal line and the associated leading under it.

Ugh, I knew I would figure it out as soon as I posted. Simply removing the carriage space after \rule{0pt}{3ex} removes the problem. The corrected code is below. CRGreathouse, thanks for your suggestion.
\begin{table} \centering \caption{Possible definitions of critical depth or thickness for tractionexerting cells on 2D 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} 
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