Question about GR_EM_SYM_DATE_001 T

If I set GR_EM_SYM_DATE_001 T , does that mean that I can use not only the 2018 inventory to simulate 2020 , but also the August inventory to simulate February?

Yes, if you use the SYM_DATE option, then you can use emissions from any date (from any year or any part of a year) for the simulation you are currently running.

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