## check_skeleton()


Inspect a product and report which parts carry real values.


Usage

``` python
check_skeleton(path)
```


A geometry column counts as *unfilled* when it is entirely zero, which is what [writer.build_hdulist()](build_hdulist.md#cubegenpy.build_hdulist) writes for a column the caller omitted. That is a heuristic - a genuinely all-zero backplane would be reported as unfilled - but for the intended use (did my arrays land where I meant them to?) it is the useful answer.