code: public EncodableHistogram nextIntervalHistogram(final Double startTimeSec,
                                             final Double endTimeSec) {
          return nextIntervalHistogram(startTimeSec, endTimeSec, false);
      }
docs: Read the next interval histogram from the log, if interval falls within a time range.
  <p>
  Returns a histogram object if an interval line was found with an
  associated start timestamp value that falls between startTimeSec and
  endTimeSec, or null if no such interval line is found. Note that
  the range is assumed to be in seconds relative to the actual
  timestamp value found in each interval line in the log, and not
  in absolute time.
  <p>
  Timestamps are assumed to appear in order in the log file, and as such
  this method will return a null upon encountering a timestamp larger than
  rangeEndTimeSec.
  <p>
  The histogram returned will have it's timestamp set to the absolute
  timestamp calculated from adding the interval's indicated timestamp
  value to the latest [optional] start time found in the log.
  <p>
  Upon encountering any unexpected format errors in reading the next
  interval from the file, this method will return a null.
  @param startTimeSec The (non-absolute time) start of the expected
  time range, in seconds.
  @param endTimeSec The (non-absolute time) end of the expected time
  range, in seconds.
  @return a histogram, or a null if no appropriate interval found