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Figure 1: A CME and prominence eruption on October 5, 1989. Superposition of SMM coronagraph images of outer corona, MLSO images of inner corona in white light, and of photosphere, chromosphere and corona in hydrogen emission. [A. Hundhausen, Coronal Diagnostics; notes from lectures at Intl. School of Space Science, L'Aquila, Italy, 1993].