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\section*{GYRE Polytrope (POLY) Format}

POLY-format files store data describing a polytrope in an
HDF5-format file. The attributes of the root group contain global
parameters, while 1-D datasets contained within the root group
specify the structure data on a grid of $n$ points extending from
center to surface. These attributes and datasets are defined as
follows:

\begin{table}[h!]
\begin{tabular}{|c|l|c|l|l|} \hline
Variable      & Object name       & (A)ttribute / & Object datatype & Definition \\
              &                   & (D)ataset     &                 &            \\ \hline
$n_{\rm poly}$ & \texttt{n\_poly}  & A & \texttt{H5T\_IEEE\_F64LE} & Polytropic index \\
$\Gamma_{1}$  & \texttt{Gamma\_1} & A & \texttt{H5T\_IEEE\_F64LE} & $(\partial \ln p/\partial \ln \rho)_{\rm ad}$ \\
$n$          & \texttt{n}        & A &\texttt{H5T\_STD\_I64LE}   & Number of grid points \\ 
$\xi$        & \texttt{xi}       & D & \texttt{H5T\_IEEE\_F64LE} & Independent variable in Lane-Emden equation \\
$\Theta$     & \texttt{Theta}    & D & \texttt{H5T\_IEEE\_F64LE} & Dependent variable in Lane-Emden equation \\
$\diff\Theta/\diff \xi$  & \texttt{dTheta}   & D & \texttt{H5T\_IEEE\_F64LE} & --- \\ \hline
\end{tabular}
\end{table}

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