Bonjour, je ne comprends pourquoi le code ci-dessous me renvoie "NaN"

Merci


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<script type="text/javascript">
var columnID_1_calc = "4.6";
var column_lenght_1_calc = "150";
var Eps_calc = "0.7";
var columnID_1_calc2 = columnID_1_calc.replace( ',' , '.' );
var columnID_1_calc3 = parseFloat(columnID_1_calc2,10);
var column_lenght_1_calc2 = column_lenght_1_calc.replace( ',' , '.' );
var column_lenght_1_calc3 = parseFloat(column_lenght_1_calc2,10);
var Eps_calc2 = Eps_calc.replace( ',' , '.' );
var Eps_calc3 = parseFloat(Eps_calc2,10);
 
 
function calcul_dead_volume1 (columnID_1_calc3,column_lenght_1_calc3,Eps_calc3) {
 
// calcul du Dead Volume
dead_volum1_calc = Math.pow(columnID_1_calc3,2)*3.14*column_lenght_1_calc3/4*Eps_calc3;
dead_volum1_calc2 = Math.round (dead_volum1_calc);
dead_volum1_calc3 = parseFloat(dead_volum1_calc2,10);
 
return (dead_volum1_calc3);
}
 
alert (calcul_dead_volume1());
 
 
 
</script>