What is the Coordinate System for C-LINE Results?

As the topic says, wondering what the coordinate system is for the C-LINE Excel file results. The ‘receptors’ seem to be in some sort of projected coordinate system with an unknown origin (e.g. 200958, 3729690 for the xLCC and yLCC attributes). I tried projecting them in Web Mercator for a test site in Atlanta, GA, USA and the resultant points were in northern Africa.

Additionally, does anyone know what exactly the points refer to in relation to the C-LINE raster output? Do they represent the center of each raster cell, the bottom left corner, or something else?

Thank you very much for any information!