Hallo, Im using NCL v.6.3.0, why I cannot use this function https://www.ncl.ucar.edu/Document/Functions/Contributed/advect_variable.shtml Thanks Chang. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20160125/1ba36028/attachment.html