Upper-left panel: cut made tangentially to the limb through the prominence of 18 May 2011 (observation No. 6 according to Table 1). Upper-right panel: distributions of measured intensities along this cut in the He ii 304 Å line, coronal iron lines round 193 Å, and X-rays. In positions along the cut, where the AIA 304 Å intensity is increased, occurrence of prominence is assumed. The both 193 Å and X-ray intensities are decreased at the prominence and cavity positions. There is also a part of the prominence further beyond the plane of the limb that is overradiated by the corona but still visible in projection on the limb in 304 Å where the corona does not emit. Bottom panel: the distribution along the cut of intensity at 193 Å is shown together with X-rays while X-ray intensities were multiplied by such a factor that the X-ray and 193 Å distributions fit each other in the cavity and corona. At the prominence, the ratio between the intensities of these two distributions is proportional to the optical thickness.
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