Remous: add abscissa as extraresult "X"

src/remous/remous.ts

@@ -452,6 +452,8 @@ export class CourbeRemous extends SectionNub {
             }
             const re = new ResultElement({ Y: ligneDeau + this.getCoteFond(x) });
 
+            re.addExtraResult("X", x);
+
             if (crbFlu[x]) {
                 re.addExtraResult("flu", crbFlu[x] + this.getCoteFond(x));
             }