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Thank you very much for help. Now I have no questions.

Unfortunately, i_membrane is not equal total transmembrane current.
How can I send you a zip file with a simple example demonstrating this problem?[/code]

For further use in computations of extracellular fields I need the values of the total transmembrane current for each segment of all sections. I make necessary calculations using hoc file with "forall" for sections and "for (x, 0)" for segments, but it is very slow. Is there any ...