Keep some cells of the starting model fixed within the mesh

Dear SimPEG users,

Hope you are all having a good start of the year. Is there a way to make cells of known information in the starting model fixed during the inversion process?

Regards

Easiest way I can think of would be to apply tight bounds on those cells.

The “upper” and “lower” properties of optimization.ProjectedGradient can be vectors of len(model)

https://docs.simpeg.xyz/content/api_core/api_Optimization.html#SimPEG.optimization.ProjectedGradient

I see. Thanks so much!