Fig. 1
Contour plots of the difference between OPAL and OP calculations for different
hydrogen abundance X and metallicity Z = 0.004.
The temperature T is in K, while R is in
g cm-3 K-3. The colored scale marks the values of the
relative difference 
. Solid
line: evolutionary path of the stellar center; dashed line: evolutionary path of
the 0.50 mass fraction of the structure; dotted line: path of the 0.95 mass
fraction of the structure; dot-dashed line: path of the 0.99974 mass fraction of
the structure, labeled as 1.00.
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