+//
+// // WARNING : all that follows works only with 'bona fide' Series
+// // (In some Series; there are more than one 'orientation'
+// // Don't expected to build a 'volume' with that!
+// //
+// // -> use sh->SplitOnOrientation(l)
+// // - or sh->SplitOnPosition(l), or SplitOnTagValue(l, gr, el) -
+// // depending on what you want to do
+// // and iterate on the various 'X Coherent File Sets'
+//
+// // if user *knows* he has to drop the 'duplicates' images
+// // (same Position)
+// sh->SetDropDuplicatePositions(true);
+//
+// // Sorting the list is mandatory
+// // a side effect is to compute ZSpacing for the file set