\begin{center}
\footnotesize
\setlength{\mylength}{\baselineskip}
\begin{longtable}{rp{0ex}p{9cm}p{0ex}RL}
\caption{Laurent polynomials and selected mutations for bucket 136.}\\

\toprule \multicolumn{1}{c}{{Node}}&& \multicolumn{1}{c}{{Laurent polynomial}} && \multicolumn{2}{c}{{Mutations from Figure~\ref{fig:136a}}} \\ \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:136a}}} \\ \midrule \endhead

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

\bottomrule \endlastfoot

454 && $xz^2+2xz+x+y+4z+\frac{1}{y}+\frac{6}{x}+\frac{2}{xz}+\frac{4}{x^2z}+\frac{1}{x^3z^2}$ && $506 \colon {}$ & $\left(\frac{(x+y)^3}{x^2y^2},z,\frac{x^3y}{(x+y)^3}\right)$ \spacer \\* 
 &&  && $510 \colon {}$ & $\left(\frac{(z+1)^2}{yz^2},\frac{1}{x},\frac{yz^3}{(z+1)^2}\right)$ \spacer \\* 
 &&  && $1991 \colon {}$ & $\left(\frac{x^3yz^2+(xz+1)^4}{x^3z^2},\frac{x^3yz^2+(xz+1)^4}{x^4yz^2},\frac{x^2z}{x^3yz^2+(xz+1)^4}\right)$ \bottomspacer \\ \addlinespace[1.1ex]
 \rowcolor[gray]{0.95}
506 && $x+\frac{2x}{y}+\frac{x}{y^2}+y+z+\frac{1}{z}+\frac{3}{y}+\frac{2y}{x}+\frac{3}{x}+\frac{y}{x^2}$ && $454 \colon {}$ & $\left(\frac{(xz+1)^3}{x^2z},\frac{(xz+1)^3}{x^3z^2},y\right)$ \spacer \\* \rowcolor[gray]{0.95}
 &&  && $2023 \colon {}$ & $\left(\frac{x^2z}{xy+xz+1},\frac{x^2y}{xy+xz+1},\frac{x}{xy+xz+1}\right)$ \bottomspacer \\ \addlinespace[1.1ex]
 510 && $x+yz^2+2yz+y+2z+\frac{2}{z}+\frac{1}{y}+\frac{2}{yz}+\frac{1}{yz^2}+\frac{1}{x}$ && $454 \colon {}$ & $\left(\frac{1}{y},\frac{(xz+1)^2}{x^3z^2},xz\right)$ \spacer \\* 
 &&  && $2041 \colon {}$ & $\left(\frac{x^2y}{xy+(xyz+1)^2},\frac{xy+(xyz+1)^2}{x^3y^2z^2},xyz\right)$ \bottomspacer \\ \addlinespace[1.1ex]
 \rowcolor[gray]{0.95}
1991 && $xz^2+2xz+x+y+4z+\frac{z^2}{y}+\frac{7}{x}+\frac{2}{xz}+\frac{4z}{xy}+\frac{4}{x^2z}+\frac{6}{x^2y}+\frac{1}{x^3z^2}+\frac{4}{x^3yz}+\frac{1}{x^4yz^2}$ && $454 \colon {}$ & $\left(\frac{x^3z^2+y(xz+1)^4}{x^3yz^2},\frac{x^4z^2}{x^3z^2+y(xz+1)^4},\frac{x^2yz}{x^3z^2+y(xz+1)^4}\right)$ \bottomspacer \\ \addlinespace[1.1ex]
 2023 && $x+y+\frac{2y}{z}+z+\frac{2z}{y}+\frac{y^2}{xz^2}+\frac{4y}{xz}+\frac{7}{x}+\frac{4z}{xy}+\frac{z^2}{xy^2}+\frac{y}{x^2z^2}+\frac{3}{x^2z}+\frac{3}{x^2y}+\frac{z}{x^2y^2}$ && $506 \colon {}$ & $\left(x+y+z,\frac{y}{z(x+y+z)},\frac{x}{z(x+y+z)}\right)$ \bottomspacer \\ \addlinespace[1.1ex]
 \rowcolor[gray]{0.95}
2041 && $xy^2z^2+2xyz+x+yz^2+4yz+y+\frac{2z}{x}+\frac{7}{x}+\frac{2}{xz}+\frac{2}{xyz}+\frac{1}{x^2y}+\frac{4}{x^2yz}+\frac{1}{x^2yz^2}+\frac{1}{x^3y^2z^2}$ && $510 \colon {}$ & $\left(\frac{xyz^2+(z+1)^2}{yz^2},\frac{xy^2z^4}{xyz^2+(z+1)^2},\frac{1}{xyz}\right)$ \bottomspacer \\ \addlinespace[1.1ex]
 \end{longtable}
\end{center}
