Chieffi & Limongi (2020) presupernova model files
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The archive cl2020.tar contains 320 solar-metallicity models
with initial masses from 12.00 to 27.95 solar masses, in steps of 0.05 solar
masses. The models describe the stellar structure at the onset of core collapse.

File names encode the initial mass in solar masses. The letter "p" is the
decimal separator: for example, 12p05.out is the 12.05 solar-mass model.

Each .out file is a whitespace-separated table. The first line contains the
column names. In each following row, the first six columns give the mass
coordinate, radius, logarithmic pressure, logarithmic temperature, logarithmic
density, and electron fraction at one point in the star. The remaining columns
give the mass fractions of the listed isotopes at the same point.

Columns
-------
M(Msun)   Enclosed mass coordinate, in solar masses
R(Rsun)   Radius, in solar radii
Log10(P)  Base-10 logarithm of pressure, in dyn cm^-2
Log10(T)  Base-10 logarithm of temperature, in K
Log10(ro) Base-10 logarithm of mass density, in g cm^-3 ("ro" denotes rho)
Ye        Electron fraction (number of electrons per baryon)
H         Hydrogen
He3       Helium-3
He4       Helium-4
C12       Carbon-12
N14       Nitrogen-14
O16       Oxygen-16
Ne20      Neon-20
Ne22      Neon-22
Na23      Sodium-23
Mg24      Magnesium-24
Si28      Silicon-28
P31       Phosphorus-31
S32       Sulfur-32
Ar36      Argon-36
Ca40      Calcium-40
Ca44      Calcium-44
Ti44      Titanium-44
Ti48      Titanium-48
Cr48      Chromium-48
Cr52      Chromium-52
Fe52      Iron-52
Fe56      Iron-56
Ni56      Nickel-56

The isotope columns are dimensionless mass fractions. The table rows follow
the stellar mass coordinate from the center to the surface.

Reference
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Chieffi, A. & Limongi, M. 2020, The Presupernova Core Mass-Radius Relation of
Massive Stars: Understanding Its Formation and Evolution, The Astrophysical
Journal, 890, 43. https://doi.org/10.3847/1538-4357/ab6739