code: @Override
    public List<IScan> getScansByRt(double rt) {
      List<IScan> scans = getRt2scan().get(rt);
      if (scans != null) {
        return scans;
      }
      return null;
    }
docs: Provided RT <i>MUST</i> be <i>EXACT</i> RT, existing in the map.
  
  @param rt RT in minutes
  @return list of Scans or null if no such RT exists