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n /1015 Hz

Figure 10.3. Measured extinctions in magnitudes versus photon frequency. The ordinate is the extinction coefficient A(v) at frequency v normalized to the extinction at the visual band, AV. The effective frequencies of the V and B bands are indicated. The absorption increases approximately linearly with frequency in the optical region. The large bump in the ultraviolet at X « 0.22 |m (1.4 x 1015 Hz) may be due to enhanced scattering by small graphite particles. [Adapted from A. Savage and B. Mathis, Ann. Rev. Astron. Astrophys. 17, 75 (1979), with permission]

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