\begin{center}
\footnotesize
\setlength{\mylength}{\baselineskip}
\begin{longtable}{rp{0ex}p{9cm}p{0ex}RL}
\caption{Laurent polynomials and selected mutations for bucket 63.}\\

\toprule \multicolumn{1}{c}{{Node}}&& \multicolumn{1}{c}{{Laurent polynomial}} && \multicolumn{2}{c}{{Mutations from Figure~\ref{fig:63a}}} \\ \midrule \endfirsthead

\multicolumn{6}{c}{{\tablename\ \thetable{} -- continued from previous page}} \\ \addlinespace[1.7ex] \midrule \multicolumn{1}{c}{{Node}}&& \multicolumn{1}{c}{{Laurent polynomial}} && \multicolumn{2}{c}{{Mutations from Figure~\ref{fig:63a}}} \\ \midrule \endhead

\midrule \multicolumn{6}{c}{{Continued on next page}} \endfoot

\bottomrule \endlastfoot

149 && $x+y+\frac{y}{z}+z+\frac{1}{y}+\frac{2y}{x}+\frac{2}{x}+\frac{y}{x^2}$ && $324 \colon {}$ & $\left(\frac{x+y}{xy},\frac{x+y}{x^2},z\right)$ \bottomspacer \\ \addlinespace[1.1ex]
 \rowcolor[gray]{0.95}
324 && $x+y+z+\frac{1}{y}+\frac{2y}{x}+\frac{2}{x}+\frac{1}{xz}+\frac{y}{x^2}+\frac{y}{x^2z}$ && $149 \colon {}$ & $\left(\frac{x+y}{xy},\frac{x+y}{x^2},\frac{y}{z}\right)$ \spacer \\* \rowcolor[gray]{0.95}
 &&  && $499 \colon {}$ & $\left(\frac{(xz+1)(xyz+y+1)}{x^2yz},\frac{(xz+1)(xyz+y+1)}{x^3yz^2},y\right)$ \spacer \\* \rowcolor[gray]{0.95}
 &&  && $583 \colon {}$ & $\left(\frac{x^2z}{xz+1},\frac{x}{xz+1},\frac{y(xz+1)}{xz}\right)$ \spacer \\* \rowcolor[gray]{0.95}
 &&  && $945 \colon {}$ & $\left(x,\frac{x^2y}{x^2yz+(x+1)^2},\frac{x^2y^2z}{x^2yz+(x+1)^2}\right)$ \bottomspacer \\ \addlinespace[1.1ex]
 499 && $x+y+z+\frac{3}{x}+\frac{2}{xz}+\frac{1}{xy}+\frac{3}{x^2z}+\frac{2}{x^2yz}+\frac{1}{x^3z^2}+\frac{1}{x^3yz^2}$ && $324 \colon {}$ & $\left(\frac{(x+y)(xz+yz+y)}{x^2yz},z,\frac{x^3z}{(x+y)(xz+yz+y)}\right)$ \bottomspacer \\ \addlinespace[1.1ex]
 \rowcolor[gray]{0.95}
583 && $x+y+z+\frac{y}{xz}+\frac{3}{x}+\frac{2}{xz}+\frac{1}{xy}+\frac{3}{x^2z}+\frac{1}{x^2yz}+\frac{1}{x^3z^2}$ && $324 \colon {}$ & $\left(x+y,\frac{xz}{x+y},\frac{x}{y(x+y)}\right)$ \bottomspacer \\ \addlinespace[1.1ex]
 945 && $x+y+z+\frac{1}{y}+\frac{2}{x}+\frac{3}{xy}+\frac{1}{xy^2z}+\frac{1}{x^2y}+\frac{1}{x^2yz}+\frac{2}{x^2y^2z}+\frac{1}{x^3y^2z}$ && $324 \colon {}$ & $\left(x,\frac{x^2z+y(x+1)^2}{x^2},\frac{x^2z}{y(x^2z+y(x+1)^2)}\right)$ \bottomspacer \\ \addlinespace[1.1ex]
 \end{longtable}
\end{center}
