docs: public void modifyTimeBase(){
  		String [] time_grid=new String[6];
  		time_grid=normalizer.getTimeBase().split("-");
  		
  		String s = "";
  		if(_tp.tunit[0] != -1)
  			s += Integer.toString(_tp.tunit[0]);
  		else
  			s += time_grid[0];
  		for(int i = 1; i < 6; i++){
  			s += "-";
  			if(_tp.tunit[i] != -1)
  				s += Integer.toString(_tp.tunit[i]);
  			else
  				s += time_grid[i];
  		}
  		normalizer.setTimeBase(s);
  	}