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Hi! I would like to import data from a very large text file. If I import all the data, Mathematica takes around 9 h to complete. Therefore I would like to import conditionally, that is for example only every 5th element. It would probably be best to do this using low level function. I have found a help topic on this (developing an import converter), however I can not get it to work. Specifically, I do not understand how to implement my own import converter, and how I can then use this to only import every 5th element of a file. Thank you!