Synthetic spot is a long call and a short put of the same strike. The payoff of the synthetic spot is the same as of the underlier.
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The screenshot shows the following portfolio:
European put struck at 10.000 with expiry in 30 days
European call struck at 10.000 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.