Yes, I refer to that. The context of this is how to deal with a scattering in the reference curve. If you repeat the measurement, it sometimes shows some not constant scatter or noise along a signal.
Consequently, in regions of low scatter, the fit (to the simulation) may should be accurate. In regions of high scatter, the fit may can be less accurate.
So, the weighting vector can come from the evaluation of different reference curves. This is not a result of the sensitivity analyses but an Information that needs to be provided by the user.
If you have this vector, you can either type the vector in or read it automatically with ETK from a text file.