Mass streamfunctions with IDL (QUANTITATIVE analysis): @grid (you may want to adjust some paths and parameters) dir='/home2/.../EXPER01' (to modify the directory of the QUANTITATIVE Lagrangian experiment) @xy0 (interative selection of reference value (0) for psi) del=1. (contour interval) @xy (plot) del=5 @xy ... o Plot of individual trajectoires: dir='/home2/.../EXPER00' (to modify the directory of the QUALITATIVE Lagrangian experiment) @trace0 (to read the content of file traj.ql) @trace1 @trace2 @trace3 ...