It changes and may not be a true picture of the relationship of the current bar to the rest of the bars. I'm still learning on how to determine which ones do and which ones don't but it struck me as not very funny when I watched the price float outside the top brown band then switched screens and came back and it was back in the band.
I think many, many indicators out there ARE repainters but usually it's not very noticeable because of their gradual trending. I started on an EA for that COG Bands but abandoned it after I saw it do that.
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