col1 = sh.donneColonne(0);
String xName = col1.getColonneDescription().getNom();
gs.setAbscissa(xName);
gs.getaX1().setAll(xName, xName, true, col1.getMin(), col1.getMax(), Position.RIGHT);
if (sh.donneNombreColonne() > 1){
col2 = sh.donneColonne(1);
} else {
col2 = col1;
}
String yName = col2.getColonneDescription().getNom();
gs.getaY1().setAll(yName, yName, true, col2.getMin(), col2.getMax(), Position.TOP);