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Apply options or futures expiration vertical bars to current chart.
addExpiry(type = "options", lty = "dotted")
options or futures expiration
type of lines to draw
Expiration lines will be drawn at appropriate dates. A chibTA object will be returned silently.
See options.expiry and futures.expiry in quantmod for details and limitations.
addTA
# NOT RUN { addExpiry() # }
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