\begin{center}
\footnotesize
\setlength{\mylength}{\baselineskip}
\begin{longtable}{rp{0ex}p{9cm}p{0ex}RL}
\caption{Laurent polynomials and selected mutations for bucket 127.}\\

\toprule \multicolumn{1}{c}{{Node}}&& \multicolumn{1}{c}{{Laurent polynomial}} && \multicolumn{2}{c}{{Mutations from Figure~\ref{fig:127a}}} \\ \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:127a}}} \\ \midrule \endhead

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

\bottomrule \endlastfoot

505 && $x+\frac{2x}{y}+\frac{x}{y^2}+\frac{x}{y^2z}+y+z+\frac{3}{y}+\frac{2y}{x}+\frac{3}{x}+\frac{y}{x^2}$ && $816 \colon {}$ & $\left(\frac{x^3y^3z^2+(xyz+1)^3}{x^2yz},\frac{x^3y^3z^2+(xyz+1)^3}{x^3y^2z^2},\frac{x^4y^3z^2}{x^3y^3z^2+(xyz+1)^3}\right)$ \bottomspacer \\ \addlinespace[1.1ex]
 \rowcolor[gray]{0.95}
816 && $xy^2z^2+xy^2z+2xyz+x+4yz+y+z+\frac{6}{x}+\frac{2}{xyz}+\frac{4}{x^2yz}+\frac{1}{x^3y^2z^2}$ && $505 \colon {}$ & $\left(\frac{x^2y^2z+(x+y)^3}{x^2y^2},\frac{x^2y^3z}{x^2y^2z+(x+y)^3},\frac{x}{y^2z}\right)$ \bottomspacer \\ \addlinespace[1.1ex]
 \end{longtable}
\end{center}
