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Schematic of the OSCAR mission orbital configuration as viewed from the top of the ecliptic plane. The twin spacecraft orbit the Sun at 1 AU with Oscar 1 leading the Earth and Oscar 2 trailing behind it. They are separated by an angle of 68° to cover stereoscopically the photosphere, the upper transition region, the corona and the heliosphere to 1 AU (see Sect. 6 for more details).
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