Isochrones

For each of the database sets a large number of isochrones have been calculated. A summary of the available data, together with the covered age range is shown in Table . Isochrones are provided for timesteps of for ages above 1 Myr (). For younger ages isochrones are available for 3.0, 5.0, 5.3, 5.6, 5.8, and 5.9 yr.

The isochrones are grouped in files named according to the following conventions: iso_Izzz_ffff_tttt.ext, where I stands for the database ID (col. 2), zzz for the metallicity, ffff and tttt indicate the logarithmic age range (from - to) covered by isochrones, and ext for the extension specifying the type of data (see Table ). For example iso_c001_0300_1020.UBVRIJHKLM includes the (UBV)$_J$(RI)$_C$ JHKLL$^\prime$M photometry of all isochrones with ages from 10$^3$ yr to 10 yr ($\sim$ 15.8 Gyr) of grid # 2.

The content of the files is the same as for the stellar tracks described above, with the following exceptions: column 1 is replaced by a line number, and column 2 now gives the initial mass along the isochrone.