flatten ex/fit

hugo/content/ex/fit/_index.md

@@ -5,21 +5,14 @@ weight = 100
 
 ## Fitting
 
-In fitting, we estimate the optimum parameters in a numerical model,
-specifically a scattering simulation,
-by minimizing the difference between simulated and reference data.
+For an introduction, see [Python tutorial > Fitting](/py/fit).
 
-BornAgain supports
-+ a variety of minimization algorithms;
-+ choice of fitting parameters, their properties and correlations;
-+ full control over objective function calculations, including the use of different normalizations and assignments of different masks and weights to different areas of the reference data;
-+ possibility to fit simultaneously an arbitrary number of data sets.
+For an informal API documentation, see [Reference > Fitting](/ref/fit).
 
-In the following we will show how to fit using the BornAgain Python API.
-For fitting through the graphical user interface, see [GUI > Fitting](/gui/gui-fitting).
-
-For most examples,
+The following examples refer to experimental or synthetic data
+in directory {{% ref-src "testdata" %}}.
+To make these data findable,
 the environment variable `BA_DATA_DIR` must point
-to the copy of directory {{% ref-src "testdata" %}} in your local BornAgain installation.
+to the copy of the `testdata/` directory in your local BornAgain installation.
 
 {{% children depth="2" %}}

hugo/content/ex/fit/advanced/_index.md

-+++
-title = "Advanced examples"
-weight = 30
-+++
-
-### Advanced examples
-
-{{% children %}}

hugo/content/ex/fit/basic/_index.md

-+++
-title = "Basic examples"
-weight = 20
-+++
-
-### Basic examples
-
-{{% children %}}

hugo/content/ex/fit/extended/_index.md

-+++
-title = "Extended examples"
-weight = 40
-+++
-
-### Extended examples
-
-{{% children %}}

hugo/content/ex/fit/extended/experiment-at-galaxi/index.md

-+++
-title = "Experiment at GALAXI"
-weight = 30
-+++
-
-## Experiment at GALAXI
-
-This is an example of a real data fit. We use our own measurements performed at the laboratory diffractometer [GALAXI](http://www.fz-juelich.de/jcns/jcns-2//DE/Leistungen/GALAXI/_node.html) in Forschungszentrum Jülich.
-
-{{< galleryscg >}}
-{{< figscg src="/img/draw/FitGALAXIData_setup.jpg" width="350px" caption="Real-space model">}}
-{{< figscg src="/img/draw/FitGALAXIData.png" width="350px" caption="Fit window">}}
-{{< /galleryscg >}}
-
-* The sample represents a 4 layer system (substrate, teflon, hmdso and air) with Ag nanoparticles placed inside the hmdso layer on top of the teflon layer.
-* The sample is generated with the help of a `SampleBuilder`, which is able to create samples depending on parameters defined in the constructor and passed through to the `create_sample` method.
-* The nanoparticles have a broad log-normal size distribution.
-* The rectangular detector is created to represent the PILATUS detector from the experiment (line 19).
-* In the simulation settings the beam is initialized and the detector is assigned to the simulation. A region of interest is assigned at line 39 to simulate only a small rectangular window. Additionally, a rectangular mask is added to exclude the reflected beam from the analysis (line 40).
-* The real data is loaded from a tiff file into a histogram representing the detector's channels.
-* The `run_fitting()` function contains the initialization of the fitting kernel: loading experimental data, assignment of fit pair, fit parameters selection (line 62).
-
-{{< show-ex file="fit/scatter2d/expfit_galaxi.py" >}}

hugo/content/ex/fit/instrument-description/index.md → hugo/content/ex/fit/galaxi.md

 +++
-title = "Experiment description"
-weight = 37
+title = "Experiment at GALAXI"
+weight = 30
 +++
 
+## Experiment at GALAXI
+
+This is an example of a real data fit. We use our own measurements performed at the laboratory diffractometer [GALAXI](http://www.fz-juelich.de/jcns/jcns-2//DE/Leistungen/GALAXI/_node.html) in Forschungszentrum Jülich.
+
+{{< galleryscg >}}
+{{< figscg src="/img/draw/FitGALAXIData_setup.jpg" width="350px" caption="Real-space model">}}
+{{< figscg src="/img/draw/FitGALAXIData.png" width="350px" caption="Fit window">}}
+{{< /galleryscg >}}
+
+* The sample represents a 4 layer system (substrate, teflon, hmdso and air) with Ag nanoparticles placed inside the hmdso layer on top of the teflon layer.
+* The sample is generated with the help of a `SampleBuilder`, which is able to create samples depending on parameters defined in the constructor and passed through to the `create_sample` method.
+* The nanoparticles have a broad log-normal size distribution.
+* The rectangular detector is created to represent the PILATUS detector from the experiment (line 19).
+* In the simulation settings the beam is initialized and the detector is assigned to the simulation. A region of interest is assigned at line 39 to simulate only a small rectangular window. Additionally, a rectangular mask is added to exclude the reflected beam from the analysis (line 40).
+* The real data is loaded from a tiff file into a histogram representing the detector's channels.
+* The `run_fitting()` function contains the initialization of the fitting kernel: loading experimental data, assignment of fit pair, fit parameters selection (line 62).
+
+{{< show-ex file="fit/scatter2d/expfit_galaxi.py" >}}
+
 ## Experiment description
 
 To successfully simulate and fit results of some real experiment it is important to have