code: public static final LCMSRange create(Range<Integer> scanRange, Integer msLevel) {
      return new LCMSRange(scanRange, msLevel, null);
    }
docs: A range that will contain all scans with the scan number range, but only at a specific
  MS-Level.
  
  @param scanRange null means the whole range of scan numbers in the run
  @param msLevel null means any ms-level