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I want to open and close particular line and calculate the impact on the other line. Currently, I am running AC solution every time transmission line is opened and closed. I thought if I can use DCLF, it would be a lot faster. When I tried to use DCLF, it worked on some cases but I am seeing NaN's with other cases. I am not sure, what I am missing here. Even if run DCLF successfully, how can I read data using python API? Thank you for your help.