Add irregular case in README

README.md

@@ -10,6 +10,10 @@ The code was developed by Karl B. Hoffmann during his PhD studies under supervis
 For usage example go through the main Jupyter Notebook [robust_defect_identification.ipynb](./robust_defect_identification.ipynb) 
 or have a look at the [examples section](./README.md#example-workflows). 
 
+The methods do **not** depend on a square grid as is shown  
+in the Jupyter Notebook [robust_defect_identification_irregular.ipynb](./robust_defect_identification_irregular.ipynb).
+with an irregular set of discretization points. 
+In fact, any gridded data can also be treated in this more general way. 
 
 ## Citation
 When using the software, please cite
@@ -85,6 +89,11 @@ PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.*
 Output plots of the main Jupyter Notebook [robust_defect_identification.ipynb](./robust_defect_identification.ipynb) for 
 the different examples follow below. They can be reproduced in [robust_defect_identification.ipynb](./robust_defect_identification.ipynb) 
 starting from the initial input image.  
+
+The synthethic example data is also available with an irregular set of discretization points 
+in the Jupyter Notebook [robust_defect_identification_irregular.ipynb](./robust_defect_identification_irregular.ipynb).
+There, parts of the effort are in building up the correct structures (in fact, pandas DataFrames) to
+represent the planar graph formed by the discretization points.
   
 Each example  
  - starts from original grayscale image (except for the synthethic data)