Topic Objective:
To create a response of the difference of two curves by one expression, which is easier than using a custom function

Topic Details:
Backgorund 
During the study of HyperStudy projects, sometimes we want to determine the difference between two curves, such as test curve and simulation curve. The official approach is to write a custom function and save as a .mvw file first, and then add this function into HyperStudy. However, There is an easier method to get the difference using only one expression.

Model Details
There are two curves. They have two vectors respectively. X1, Y1 are the vectors of curve 1. X2, Y2 are the vectors of curve 2. You need to create these 4 vectors in HyperStudy expression builder before creatin.

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