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SmoothPrice[period]=(SmoothPrice[period-1]*(BandBars-1)+source.close[period])/BandBars;
SmoothRange[period]=(SmoothRange[period-1]*(BandBars-1)+source.high[period]-source.low[period])/BandBars;
Top[period]=SmoothPrice[period]+SmoothRange[period]*Deviation;
Bottom[period]=SmoothPrice[period]-SmoothRange[period]*Deviation;
if source.close[i]< Top[i] then Color[i] = Up;
if source.close[i]> Bottom[i] then Color[i] = Down
else Color = Neutral
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