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hi DZC,
this operation is very simple. fist select v(a), then press middle key of your mouse(or press left and right key simultaneous) and drag it to expression window. sencond, click "-" in the oprators. third, use the same opration like the first drag v(b) to the expression window and place it on the right of "-".
fourth, in the result window give a name of v(a)-v(b),such as diffab. then click apply in the expression builder window. the diffab will appear in expressions window.
double click diffab(in expressions window) then the curves of v(a)-v(b) will show in awanwaves.
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