Collar is a way of limiting both the potential profit and potential loss of a position in the underlier.
For a long position in the underlier the Collar consists of a short OTM call and a long OTM put, the payoff is flat avobe the strike of the call and below the strike of the put.
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The screenshot shows the following portfolio:
European put struck at 9.000 with expiry in 30 days
European call struck at 11.000 with expiry in 30 days
This is an excerpt from iOptioneer option trading reference application. In order to build the real-time dynamic strategy graph and run simulations you will need to download the application from App Store.