Astrometry of 1FGL J1018.6–5856 from optical and radio data. The black line represents the proper motion fit to the data and the gray region its 1-σ confidence interval. The dotted orange line represents the proper motion reported by Gaia DR2 and the orange region its 1-σ confidence interval. R represents the residuals from each fit. Error bars show the 1-σ uncertainty on the individual positions. In the case of the Gaia DR2 data the error bars are smaller than the markers. Positions are referred to the Gaia DR2 position at J2015.5.
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