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Fig. 1

image

(u,v) coordinates of the data points. New (u,v) points acquired during 2014 and 2015 are represented by black open circles and blue filled circles, respectively. Previously published interferometric observations obtained in 2005 and 2012 (Raban et al. 2009; López-Gonzaga et al. 2014) are shown with green and red circles, respectively. See Sect. 2.2 for details on how the data were selected.

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