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Portable Network Graphic  |  2003-02-25  |  8.7 KB  |  561x65  |  8-bit (32 colors)
   ocr: Line profile of O VI from UVCS observed in a polar coronal hole (lower panel) compared to disk observation from SUMER. The extremely broad O VI line yields velocities up fo 500 km/s, which corresponds to a kinetic temperature of 200 million K.