gravimetry 0.7.2

Satellite gravimetry: mission and sensor noise (electrostatic and cold-atom accelerometers, laser ranging, gradiometers), closed-loop simulation, GRACE processing (technical notes, smoothing, stripe removal, water height), earthquake gravity, a Kalman smoother and atmospheric waves.
Documentation 
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# Test fixtures

Real files, kept whole up to the end of their header and truncated after it, downloaded on
2026-10-23.

| File | Source | Kept | Licence / credit |
|---|---|---|---|
| `tn14_excerpt.txt` | GRACE TN-14 (GSFC SLR C20/C30, v3, 30 Sep 2026), [PO.DAAC docs](https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/gracefo/open/docs/TN-14_C30_C20_GSFC_SLR.txt) | header, first 3 and last row | NASA, no use constraints |
| `tn13_excerpt.txt` | GRACE TN-13 (CSR RL06.3 geocentre), [PO.DAAC docs](https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/gracefo/open/docs/TN-13_GEOC_CSR_RL0603.txt) | header, first and last month | NASA, no use constraints |