Add slide about accessing data

lectures/debugging-strategies/slides.qmd

@@ -531,6 +531,14 @@ issues in line 9 and 13
  
 # Errors due to data access and communication
 
+## Accessing data {.leftalign}
+
+ - Data has to be available and accessible
+ - Typical errors are out-of-bounds accesses
+   (resulting in a segmentation fault in languages like C)
+ - Usually manual checks are needed
+
+
 ## Postprocessing example (1/4)
 
  - Extract data from netCDF file and calculate interpolation weights