ok that's what I was thinking about, I will try youre solution, thank you for youre help Simon. Bye, Joachim Sebbag -- View this message in context: http://rrd-mailinglists.937164.n2.nabble.com/monthly-display-problem-tp6621836p6625314.html Sent from the RRDtool Users Mailinglist mailing list archive at Nabble.com.