Francois

@tmedani Is there anything left to do from this issue?

Would you still like to update the filters in your PAC functions?

@sbaillet @SoheilaSamiee Can you please close this issue if you think this is not an issue? Thanks

Any update on this front?

@sbaillet @SoheilaSamiee Any update? If you are satisfied with the filters used in the current function, we would simply close this issue.

@sbaillet @SoheilaSamiee Can you please let me know whether you want to keep this issue open or not? Thanks

@LeoNouvelle Is this PR still a work in progress?

> Even though it's been like this for some time, I think the broken flattening PCA should be fixed asap. The PCA option is not used in any of our...

> Regarding tutorials, how about a section for flattening right after the [Unconstrained orientations](https://neuroimage.usc.edu/brainstorm/Tutorials/SourceEstimation?highlight=%28unconstrained%29#Unconstrained_orientations) section in the source estimation tutorial, or in the advanced section? Maybe an advanced section just...

Is this issue the same as what is discussed in this PR: https://github.com/brainstorm-tools/brainstorm3/pull/433 ?