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LASCO/C2 observations of a CME on 2000 January 02 at 07:54 UT. Top left: A level 2 background-model subtracted image of the event. Top right: Running-difference image reproduced from the CACTus catalog with the angular span of the CME detection indicated by the white lines. (The manual CDAW catalog uses similar such running-difference images.) Bottom left: Running-difference image reproduced from the SEEDS catalog with the CME front detection highlighted in red (and the extended “half-max-lead” in purple). Bottom right: Normalised radial-gradient filtered (NRGF) image taken from the CORIMP catalog with the angular span of the CME detection indicated in blue, the pixel-chained CME structure in yellow and the CME front in red.
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