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Fig. 8

Interpolated maps of the α factor of asymmetry of EUV coronal emissivity a), and optical thickness τ193b) derived from prominence EUV and X-ray observations of 18 May 2011. Striation in the α map in panel a) is caused by problems of bilinear interpolation explained in the last paragraph of Sect. 3.3.
This figure is made of several images, please see below:
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