<div dir="ltr"><div><div><div>Hallo,<br></div>Im using NCL v.6.3.0,  why I cannot use this function<br><a href="https://www.ncl.ucar.edu/Document/Functions/Contributed/advect_variable.shtml">https://www.ncl.ucar.edu/Document/Functions/Contributed/advect_variable.shtml</a><br><br></div>Thanks<br></div>Chang.<br></div>