A question about the resource code

Dear all

I have read the resource code related wi the nonlinear optical response. However, I think it is different from the equations given by (https://doi.org/10.1103/PhysRevB.67.165332) and (https://doi.org/10.1238/Physica.Topical.109a00128). For example, the inter-band part in the article is:
image
but I think the equation in the code is:
Equation
I mark the difference by red color.
I think the latter one makes more sense because it can guarantee the symmetry of b and c.

Did I read the resource code correctly?