# Subtract another DataBundle

## Summary
Subtract a DataBundle element using another DataBundle

## Metadata
- **Module ID:** SubtractDatabundles
- **Module path:** /home/runner/work/MoDaCor/MoDaCor/src/modacor/modules/base_modules/subtract_databundles.py
- **Module version:** 20251029.1
- **Keywords:** subtract, background, databundle

## Required data keys
- signal

## Modifies
- **signal**: signal, uncertainties, units

## Required arguments
- with_processing_keys

## Default configuration
```json
{
  "with_processing_keys": null
}
```

## Argument specification
| Argument | Type | Required | Default | Description |
|---|---|---|---|---|
| `with_processing_keys` | list | Yes | - | Two processing keys: minuend then subtrahend. |

## References
DOI 10.1088/0953-8984/25/38/383201

## Notes

            This subtracts one DataBundle's signal from another, useful for background subtraction.
            'with_processing_keys' in the configuration should contain two keys, the operation
            will subtract the second key's DataBundle from the first key's DataBundle.