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Fig. 1

image

Left panel: filament observed with the Meudon spectroheliograph in Hα on July 15, 2014 at 07:20 UT. Right panel: the corresponding filament (in reverse colour) as it crossed the limb as a prominence on July 17, 2014, observed by SOT using the Ca ii filter at 08:04 UT. A movie of the SOT image is available online (Movie 1).

This figure is made of several images, please see below:

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