POLY File Format

Files in POLY format store HDF5 data describing a composite polytrope model. This format adheres to the following conventions:

• All data objects are attached to the root HDF5 group (/)

• Real values are written with type H5T_IEEE_F64LE when GYRE is compiled in double precision (the default), and type H5T_IEEE_F32LE otherwise

• Integer values are written with type H5T_STD_I32LE

Data items in the root HDF5 group are as follows:

Data Item	Variable	Object type	Data type	Definition
n	\(N\)	attribute	integer	number of grid points
n_r	\(\nreg\)	attribute	integer	number of regions
n_poly	\(n_{i}\)	attribute	real (n_r)	polytropic indices of regions
z_b	\(z_{i-1/2}\)	attribute	real (n_r-1)	radial coordinates of region boundaries
Delta_b	\(\Delta_{i-1/2}\)	attribute	real (n_r-1)	log density jump of region boundaries
Gamma_1	\(\Gamma_{1}\)	attribute	real	first adiabatic exponent
z	\(z\)	dataset	real (n)	polytropic radial coordinate
theta	\(\theta\)	dataset	real (n)	Lane-Emden variable
dtheta	\(\theta'\)	dataset	real (n)	Derivative of Lane-Emden variable