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Table 3.

Motion of the south pole on the CCD in the x and y directions for each winter (Δx and Δy) calculated over the longest time interval without repointing the instrument (Δt).

Δx Δy Δt
(pixel unit) (pixel unit) (day)
2008 25 10 128
2009 13 8 86
2010 25 11 115
2011 33 16 211

Notes. The pixel scale is 3.41 arcsec per pixel.

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