Differential work integrals, κ_R and κ_T were plotted. Panel a) shows unstable f-modes (l = 9n = 0 and l = 10, n = 0) for M = 12 M_⊙ and X_c ≈ 0.65 (opacity data No. 25). Panel b) shows unstable l = 1 modes for M = 12 M_⊙ and X_c = 0.25 (opacity data No. 25). Panel c) shows unstable l = 3 and l = 4 modes for M = 10 M_⊙ and X_c ≈ 0.26 (opacity data No. 27). (A color version of the figure is available online.)