## StoredCalModel


Return a cal factor that was already computed and stored.


Usage

``` python
StoredCalModel(stored)
```


The recalibration path: read `CAL_FACTOR` back from a downloaded FITS and reuse it verbatim (no recompute), so a rebuild with a new [Background](Background.md#cubegenpy.Background) changes only the primary cube and leaves the `CAL_FACTOR` HDU byte-identical.