I'm calculating the electron density difference (EDD) and would like to analyze the local integral curve and the plane-averaged density difference curve. However, after searching through numerous references, I haven't found any papers that discuss these two types of curves.

I'd like to know if there are any references that use the local integral curve (Figure 1), charge displacement curve (Figure 2), and electron density curve (Figure 3) for the electron density difference. I'd like to analyze and discuss my results using these references.

(All images above are from http://sobereva.com/638, which provides detailed information on how to plot EDD using multiwfn. I highly recommend checking it out.)