HR diagram with evolutionary tracks for masses M = 2.5−30 M_⊙ and metallicity Z = 0.015. The thick solid lines indicate the unstable low-order p- and g-type modes of degrees ℓ = 0 − 2. Thick dotted lines show the high-order g-mode instability domain. In the left and right panels, we assumed the OPAL and OPLIB opacity data, respectively.