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The Multi Element Telescope for Imaging and Spectroscopy (METIS)
coronagraph is an instrument belonging to the SOLar Orbiter(SOLO)
mission payload which will perform the imaging of the solar corona in
three different spectral ranges: 30.4 nm (He-II Lyman-α line),
121.6 nm (H-I Lyman- α line) and visible spectral range (500-650
nm). Optical coatings...