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Selecting features in coronagraph images can be troublesome and provide widely different results. (a) A LASCO/C3 image of a well-known CME observed on 27 February 2000 (image provided courtesy of NASA). Nine distinct features have been identified in the image and are labeled (i)–(ix), (b) the height-time plots for each of the nine features, and the speed of each determined from the least-squares linear fit applied through each, (c) a LASCO/C2 image of one of the well-known “Halloween” CMEs (image also available courtesy of NASA), with 20 distinct features selected.
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