Hi David, I've tried using sep="\t" but it doesn't work, unfortunately. Thanks for your help. ----- ---- Isaac Research Assistant Quantitative Finance Faculty, UTS -- View this message in context: http://r.789695.n4.nabble.com/Can-t-import-this-4GB-DATASET-tp4607862p4608936.html Sent from the R help mailing list archive at Nabble.com.