Comparison of the Rosseland mean opacity coefficient plotted as a function of temperature inside of stellar models with masses of about 5 M_⊙ (left panel) and 10 M_⊙ (right panel). We used metallicity Z = 0.015 and the element mixture by Asplund et al. (2009). Different lines correspond to different opacity tables (solid line − OPAL, dashed line − OP, and dotted line − OPLIB).