Reply To: Question on Coordinate System
This information is covered in the Guidelines and Standards for Tactile Graphics which is available for download from the BANA website. Near the beginning of Unit 6 Mathematical and Scientific Diagrams there is a chart which indicates when to use the numeric indicator. You omit them for Cartesian Graphs, but include them for Line Graphs. If you consider this to be a Cartesian graph, then you would omit the numeric indicator.
Betty