Is there a way to "high-pass" a time series with Ferret?? Thanks in advanve -Ilana +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ + Ilana Wainer + + Dept. Oceanografia Fisica - Universidade de Sao Paulo + + Praca do Oceanografico 191 - 05508-900, Sao Paulo - Brazil + + Phone: +55-11 818 6578 Fax: +55-11 210 30 92 + +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++