# {py:mod}`abtem.core.constants`

```{py:module} abtem.core.constants
```

```{autodoc2-docstring} abtem.core.constants
:parser: rst
:allowtitles:
```

## Module Contents

### Data

````{list-table}
:class: autosummary longtable
:align: left

* - {py:obj}`eps0 <abtem.core.constants.eps0>`
  - ```{autodoc2-docstring} abtem.core.constants.eps0
    :parser: rst
    :summary:
    ```
* - {py:obj}`kappa <abtem.core.constants.kappa>`
  - ```{autodoc2-docstring} abtem.core.constants.kappa
    :parser: rst
    :summary:
    ```
````

### API

````{py:data} eps0
:canonical: abtem.core.constants.eps0
:value: >
   None

```{autodoc2-docstring} abtem.core.constants.eps0
:parser: rst
```

````

````{py:data} kappa
:canonical: abtem.core.constants.kappa
:value: >
   None

```{autodoc2-docstring} abtem.core.constants.kappa
:parser: rst
```

````