code: public FlatDataList getXColumn(Object column) {
          FlatDataList flatDataList = new FlatDataList();
  
          for(Record r : values()) {
              flatDataList.add(r.getX().get(column));
          }
  
          return flatDataList;
      }
docs: It extracts the values of a particular column from all records and
  stores them into an FlatDataList.
  
  @param column
  @return