I added the feature to compute the band-limited root-mean-square (sometimes called BLRMS) on Pastavi.
The attached figure shows the usage of this feature.

1. open the option of TimeSeries
2. check the box for BLRMS
3. set the parameters for band pass filter and time step

There are the examples of computed BLRMS (see Fig2 and 3).

If you found the error or bug, please let me know.