étape 4 0000FF 4 1165.8 1169.2 1249.2 1275.4 1323.7 1422.8 1431.8 1470.7 1502.7 1573.4 1618.1 1617.5 1646.4 1693.1 1842.5 1838.7 1747.9 1712 1706.4 1685.4 1648 1624.5