Hi, window method does not extend the fec and mat slots in FLBiol objects. data(ple4) bio <- window(as(ple4,'FLBiol'), 1978, 2015) bio at fec bio at m Thanks, Dorleta -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.r-forge.r-project.org/pipermail/flr-list/attachments/20171026/315ee838/attachment.html>