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bollies
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lmkwin
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The center line is dashed on the Bollinger band. To make it solid, put a SMA line that is the same as the BB length. Make that SMA line solid.
The center line of the Bollinger Band is a SMA, so a 20,2 on the BB is showing a 20 day SMA with a line above and below that is 2 standard deviations from that SMA line.
https://school.stockcharts.com/doku.php?id=technical_indicators:bollinger_bands0