code: def rprojs(self):
          
          # TODO: should this be moved to Mesh?  Even though its surely possible
          # to compute without being placed in orbit, projecting in x,y doesn't
          # make much sense without LOS orientation.
          rprojs = np.linalg.norm(self.coords_for_computations[:,:2], axis=1)
          return ComputedColumn(self, rprojs)
docs: Return the projected (in xy/uv plane) radius of each element (either
          vertices or centers depending on the setting in the mesh) with respect
          to the center of the star.
  
          NOTE: unscaled
  
          (ComputedColumn)