code: func CoordinatesFlat(flatCoords []float64, offset, end, stride, dim int) *CoordinatesFlatElement {
  	return &CoordinatesFlatElement{
  		flatCoords: flatCoords,
  		offset:     offset,
  		end:        end,
  		stride:     stride,
  		dim:        dim,
  	}
  }
docs: // CoordinatesFlat returns a new Coordinates element from flat coordinates.