File:Wolf-effect-doppler-like-graph.png

Summary
Wolf Effect illustrated. The chart shows spectral lines of ionized oxygen (black lines, right) at rest, together with Doppler-shift lines (red) moving at 84 km/sec, and Wolf-shifted lines (blue) also at rest.

Illustration by Ian Tresman, based on a diagram in: James, Daniel F. V., Savedoff, Malcolm P., and Wolf, Emil, "Shifts of spectral lines caused by scattering from fluctuating random media" (1990) Astrophysical Journal 359: 67—71. (Full text, PDF)