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@@ -51,7 +51,7 @@ The subsurface below our feet is utilized in many different ways. We extract fre
 
 Creating structural geological models not only in 1D boreholes or 2D cross-sections but also in 3D models is a first step to gain a comprehensive knowledge of the subsurface. Apart from actually drawing models, most efforts to create structural geological models in 3D are built in and restricted to commercial software packages such as GeoModeller [@{geomodeller}], Petrel, Move, GoCad [@{gocad}] and others. The aim of **GemPy** [@{gempy}] and **GemGIS** [@{gemgis}] and associated open-source packages is to provide open-source software tools to create 3D structural geological models from maps, cross sections, borehole information, stratigraphic boundaries at the surface and the subsurface, orientation measurements of the stratigraphic units, mapped horizons from seismic data or information inferred from other geophysical methods. 
 
-The tutorial materials presented here are adopted from a mapping class for undergraduate students majoring in Applied Geosciences at RWTH Aachen University, Germany. The purpose of this paper-based analog course is to develop the 3D geological thinking of the students and to allow them to obtain a concept of the structures in the subsurface through constructing and analyzing maps and 2D cross-sections [@{bennison}; @{powell}]. The tutorials presented here can be seen as the logical continuation of the introductory mapping course. These tutorials motivate students to dig deeper into the data or to confirm their previous results. The barrier to utilize the Python language and associated packages for processing and visualizing data is lowered by the use of these tutorials. The usage of 3D structural models in teaching has also been adapted to make use of AR-Sandboxes [@{Wellmann2022}]. Here, models created through **GemGIS** and **GemPy** can be recreated in the AR-Sandbox. A generation of a modified map can then be triggered by manual interaction with sand, hence changing the topography of the model.  
+The tutorial materials presented here are adopted from a mapping class for undergraduate students majoring in Applied Geosciences at RWTH Aachen University, Germany. There, the students work with print-outs of these maps, millimeter paper, rulers and pencils to solve the different tasks of the various tutorials. The purpose of this paper-based analog course is to develop the 3D geological thinking of the students and to allow them to obtain a concept of the structures in the subsurface through constructing and analyzing maps and 2D cross-sections [@{bennison}; @{powell}]. The tutorials presented here can be seen as the logical continuation of the introductory mapping course. These tutorials motivate students to dig deeper into the data or to confirm their previous results. The barrier to utilize the Python language and associated packages for processing and visualizing data is lowered by the use of these tutorials. The usage of 3D structural models in teaching has also been adapted to make use of AR-Sandboxes [@{Wellmann2022}]. Here, models created through **GemGIS** and **GemPy** can be recreated in the AR-Sandbox. A generation of a modified map can then be triggered by manual interaction with sand, hence changing the topography of the model.  
 
 # Resources
 The following resources are provided before going through the tutorials. It is recommended to use an [Anaconda Python distribution](https://www.anaconda.com/) and [Jupyter Notebooks](https://jupyter.org/) to access the tutorials. Both **GemPy** and **GemGIS** have been developed in recent years at the [Department for Computational Geosciences and Reservoir Engineering at RWTH Aachen University, Germany](https://www.cgre.rwth-aachen.de/). Both libraries are stored on Github and have well-documented resources: