\begin{center}
\footnotesize
\setlength{\mylength}{\baselineskip}
\begin{longtable}{rp{0ex}p{9cm}p{0ex}RL}
\caption{Laurent polynomials and selected mutations for bucket 8.}\\

\toprule \multicolumn{1}{c}{{Node}}&& \multicolumn{1}{c}{{Laurent polynomial}} && \multicolumn{2}{c}{{Mutations from Figure~\ref{fig:8a}}} \\ \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:8a}}} \\ \midrule \endhead

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

\bottomrule \endlastfoot

27 && $xy+x+\frac{x}{yz}+y+z+\frac{1}{x}$ && $177 \colon {}$ & $\left(\frac{x^2yz}{xyz+y+z},xyz+y+z,\frac{xy}{xyz+y+z}\right)$ \bottomspacer \\ \addlinespace[1.1ex]
 \rowcolor[gray]{0.95}
177 && $x^2yz+xyz+x+y+z+\frac{1}{x}+\frac{1}{x^2z}+\frac{1}{x^2y}$ && $27 \colon {}$ & $\left(\frac{xyz+x+yz^2}{yz},\frac{y^2z^2}{xyz+x+yz^2},\frac{xy}{xyz+x+yz^2}\right)$ \bottomspacer \\ \addlinespace[1.1ex]
 \end{longtable}
\end{center}
