add frequency-separation decomposition

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (0e0aff0) 90.21% compared to head (7f88318) 90.22%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #101 +/- ## ======================================= Coverage 90.21% 90.22% ======================================= Files 19 19 Lines 2719 2732 +13 ======================================= + Hits 2453 2465 +12 - Misses 266 267 +1 ```

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