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Tolerance for variances in individual PW units is a subjective opinion. I have noticed those unit variances in every type of device I have ever purchased from PC's to printers to cars to radios, etc.
A slight refresh on page turns may cause some to return their units and be barely noticeable to others. The same response happens with "pin" holes, background hues and "stuck pixels." Some folks return Monitors for a single stuck LCD pixel which may require a high magnifying photo lens to detect. I never even look for them.
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