<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">At the top of the fortran subroutine there is a comment “! this version uses variables in the order latxlon, reversed from orig”. You should thus consider switching “nlati” and “nloni” as arguments of garethtrough() in line 38 of “trough.ncl” file. You should also adjust your plotting resources as there are some warnings(e.g. from the spline function) which I assume should be considered for the right output, otherwise the output is as attached.<div class=""><br class=""></div><div class="">Jack</div><div class=""><br class=""></div><div class=""> </div></body></html>