I have tried to search the archive but I didn't see any useful information.
What I really want to do is like this. Say the Y value of one line is around 1000 and that of the other line is around 1. If one plot these two lines in the same picture with the same scale of Y axis, the smaller value line will be hardly seen. So I hope the 2D plot can treat them different, with larger scale to the smaller one. Excel can do this easily. I hope Mathematica also can. Thanks.