code: @Pure
  	public static Point2d EL2_L2(double x, double y) {
  		return new Point2d(x, y + (LAMBERT_2E_YS - LAMBERT_2_YS));
  	}
docs: This function convert extended France Lambert II coordinate to
  France Lambert II coordinate.
  
  @param x is the coordinate in extended France Lambert II
  @param y is the coordinate in extended France Lambert II
  @return the France Lambert II coordinate.