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We present an improved geometric-distortion solution for the Hubble SpaceTelescope UVIS channel of Wide Field Camera 3 for ten broad-band filters. Thesolution is made up of three parts: (1) a 3rd-order polynomial to deal with thegeneral optical distortion, (2) a table of residuals that accounts for bothchip-related anomalies and fine-structure introduced by the filter, and (3) alinear transformation to put the two chips into a convenient master frame. Thefinal correction is better than 0.008 pixel (~0.3 mas) in each coordinate. Weprovide the solution in two different forms: a FORTRAN subroutine and a set offits files, one for each filter/chip/coordinate.

Astrometry and photometry with HST WFC3. II. Improved geometric-distortion corrections for 10 filters of the UVIS channel