# Normal map on mirrored model

I have mirror model, that I made to save the size of textures. But in testing I see, that part of model, that must be flat, has a visible seams:

Normal map is configured to non-color, so it isn't a problem.

The problem, as I see, that there is no color in RGB that corresponds to 0.5, 0.5, 1. #8080ff is bigger than this value, about 0.503, 0.503, 1 and #7f7fff is less (about 0.498, 0.498, 1)

So now I found only one method to solve this problem - create a mask and mix them this way:

Less then value is 0.00001

So is there a suitable method for using normal map on a mirror model?