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+++
title = "Off-specular"
weight = 30
+++
## Off-specular scattering simulation
To set up and run a simulation with off-specular scattering, use
```python
import bornagain as ba
scan = ...
sample = ...
detector = ba.OffspecDetector(...)
simulation = ba.OffspecSimulation(scan, sample, detector)
# ... set options
result = simulation.simulate()
```
Supported scan types: grazing angle scan, wavelength scan.
For the constructor arguments, see sections [scan](/ref/instr/scan),
[sample](/ref/sample), and [OffspecDetector](/ref/instr/det/offspec).
For optional settings, see [simulation options](/ref/sim/setup/options).
For the return type of function `simulate()`,
see [Datafield](/ref/data/datafield).
##### Examples
* [basic off-specular simulation](/ref/sim/class/offspec/ex/index.md)
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