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@pwborthwick Hello, Thank you for your information! I have read your code in https://github.com/pwborthwick/harpy/blob/48fc93344738a0746e01cf6fb3148a4d6a7c7a04/source/cc/fcc.py and code about eom-ccsd in https://github.com/pwborthwick/harpy/blob/48fc93344738a0746e01cf6fb3148a4d6a7c7a04/source/eom.py and notice that in eom.py you still select the output...

@pwborthwick Hi, I understand that we need to set a high energy cutoff and focus on low energy excitation states, thus there is an upper bound. However, what makes me...