Add Volume of a series, if available, to the current chart. This is the default TA argument for all charting functions.
use log-scale for volume
Add volume bars to current chart if data object contains appropriate volume column.
log.scale will transform the series via standard R graphics mechanisms.
Volume will be draw in a new window on the current chart. A chobTA object will be returned silently.
Jeffrey A. Ryan
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## Not run: addVo() ## End(Not run)
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