Left: celestial position difference between the IGAPS catalogue and Gaia DR2 stars on CCD#1 of INT image r908084. The original pipeline solution is shown in cyan and the refined solution in orange. The binned median curves are shown in blue and red, respectively. Right: histogram of the median celestial position difference for WFC CCD#4 between IGAPS and Gaia DR2 by filter. The r filter (orange) includes IPHAS and UVEX data. The median differences are: 72 (URGO), 39 (g), 38 (r), 46 (Hα) and 45 (i) mas.
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