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Fig. 1

image

Definition of the instrument axes x, y, z of the Scanning Reference System (SRS), the basic angle Γ, and the field angles g and h specifying the observed direction to a star (u) in either field of view. ϕ is the along-scan instrument angle of the star. In the SRS the direction to the solar system barycentre, b, is specified by the angles ξ and Ω.

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