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the dielectric constant for soldermask is lower than that of air. therefore, for outer layer traces, adding a thin dielectric such as soldermask has the effect of *lowering" the impedance.
you need to change the trace width if it fall sin both mask and unmask region to get constant impedance. To view the chage you can use polar software or if you are usig Allegro Expert it can do it for you too.
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