Also, you have to remember, displayed value is rounded to closest level of display formatting, usually a .*5 or higher gets DISPLAYED as next highest value(ie- 0.0005, rounded to 3 decimals will display as 0.001, however...the value is still 0.0005, so mathematically, they are the same, just visually they change...unless you force a round off error using the round(several) functions...
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