Astrometric planet search around southern ultracool dwarfs - IV. Relative motion of the FORS2/VLT CCD chips

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Fig. 5.

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Same as Fig. 3, but for proper motions: the approximation of Eq. (6) (solid lines) and the model response W_CAL(y) to the step change Δμ = −56.0 mpx yr⁻¹ in the proper motions of stars in chip 2 (dashed lines).

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