Hal, Set the periodicity to 0. But this will slow down the computation time tremendously, so also reset the maxiter from 2110000000 down to 21100. Lee Hal Lane said: JackOTradez's "zoom2" (as well as most of his other zooms) has apparently erroneous horizontal streaks in its black 'lake' areas when I calculate it with Fractint 20.02.4 on my Win98 SE vanilla Gateway. I've not had this problem on other images. This happens at any size image / any viewport of the image. I once saw this a long time ago in another fractal on another machine but was unsuccessful in determining what was going on at that time. Since I had not seen this particular artifact in at least six or eight years I assumed that its mechanism had been uncovered and dealt with. I have been 'given' a 2nd chance to see and ask for assistance with this particular artifact and I don't want to drop the ball this time... Does anyone else see these horizontal streaks in the 'lakes' when they create this image? <--<<