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Bollinger Band Calculation Differences

Great platform. However, I have a question. Why can't I get your Bollinger Bands to match what I calculate. I have input your data in to my spreadsheet so it's not that the data might be slightly different. The differences are not tiny. Are you using EMA instead of a SMA? Or, perhaps (H+L+C)/3 instead of Close?

Do you supply anywhere the equations you use for your indicators?
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