docs: public String drawAlmostCentreRectangle(long horizon, RectangularRegion ... rect){
  		String ret = "";
  		int j = 1;
  		ret = "set xrange [0:" + horizon +"]"+ "\n";
  		ret += "set yrange [0:" + horizon +"]" + "\n";
  		for (int i = 0; i < rect.length; i++) {
  			//rec 
  			ret += "set obj " + j + " rect from " + extractBoundingBoxesFromSTPs(rect[i]).getAlmostCentreRectangle().getMinX() + "," + extractBoundingBoxesFromSTPs(rect[i]).getAlmostCentreRectangle().getMinY() 
  					+" to " + extractBoundingBoxesFromSTPs(rect[i]).getAlmostCentreRectangle().getMaxX() + "," +extractBoundingBoxesFromSTPs(rect[i]).getAlmostCentreRectangle().getMaxY() + 
  					" front fs transparent solid 0.0 border " + (i+1) +" lw 0.5" + "\n";
  			j++;
  			//label of centre Rec
  			ret += "set label " + "\""+ rect[i]+"-c" +"\""+" at "+ extractBoundingBoxesFromSTPs(rect[i]).getAlmostCentreRectangle().getCenterX() +"," 
  					+ extractBoundingBoxesFromSTPs(rect[i]).getAlmostCentreRectangle().getCenterY() + " textcolor lt " + (i+1) + " font \"9\"" + "\n";
  			j++;
  		}
  		ret += "plot NaN" + "\n";
  		ret += "pause -1";
  		return ret;
  	}