Issue I491 [gui,contours] Allows PE/Contour views of fields defined by a user program. Currently the PE/Contours views only plot fields generated from a real potential array. They do ignore fields generated from user programs (e.g. mfield_adjust and efield_adjust segments). One workaround is rather to plot contours using the method in Issue I178.2 "New field lines/vector plotting example ('contour')". Another method (suitable only really for potential arrays not magnetic arrays where you plot field vectors) is to programmatically build a real potential array given the space potentials you know. You may use the SL Libraries (Issue I472) or the newer simion.pas interface within SIMION (Issue I422).