private void AddToAxisCollection(List<AxisHelper> newAxisHelpers, int ID, string descr, string units, double correction, double offset)
 {
     if (ID == 0) return;
     foreach (AxisHelper ah in newAxisHelpers)
     {
         if (ah.AxisID == ID) return;
     }
     AxisHelper ahnew = new AxisHelper();
     ahnew.AxisID = ID;
     ahnew.Description = descr;
     ahnew.Units = units;
     ahnew.Correction = correction;
     ahnew.Offset = offset;
     newAxisHelpers.Add(ahnew);
 }