docs: public ArrayList<DensityGrid> getNeighbours()
  	{
  		ArrayList<DensityGrid> neighbours = new ArrayList<DensityGrid>();
  		DensityGrid h;
  		int[] hCoord = this.getCoordinates();
  		
  		for (int i = 0 ; i < this.dimensions ; i++)
  		{
  			hCoord[i] = hCoord[i]-1;
  			h = new DensityGrid(hCoord);
  			neighbours.add(h);
  			
  			hCoord[i] = hCoord[i]+2;
  			h = new DensityGrid(hCoord);
  			neighbours.add(h);
  			
  			hCoord[i] = hCoord[i]-1;
  		}
  		
  		return neighbours;
  	}