On Balance Volume EMA-13

A simple EMA-13 overlay for OBV charts
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study(title="On Balance Volume EMA-13", shorttitle="OBV EMA")
src = close
obv = cum(change(src) > 0 ? volume : change(src) < 0 ? -volume : 0*volume)
plot(ema(obv, 13), color=blue, title="OBV")
hi, how to draw 13 ema of obv?
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