SDO/AIA 211 Å passband intensity at 10:39:24 UT a) and the corresponding density map b). The contours show the harmonic plasma emission frequencies related to the measured coronal densities at 150, 200 and 300 MHz. The contours have been smoothed by a boxcar average of 3.6 arcsecs for display purposes, while dashed lines are at 1.0 R⊙ and 1.2 R⊙.
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