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Although I searched for (Google and FontForge manual) , I didn't find a clear explanation and, much less, some directions to solve that problem. I found this explanation too: https://blogs.adobe.com/CCJKType/2012/04/the-bluevalues-array.html but I dind't understan the practical way to act. Please, be kind enough to give me the basic lines to avoid all this. Thank you
Elements in BlueValues/OtherBlues array are disordered
Elements in BlueValues/OtherBlues array are too close (Change BlueFuzz)