code: public void copyInto(final DoubleHistogram targetHistogram) {
          targetHistogram.reset();
          targetHistogram.add(this);
          targetHistogram.setStartTimeStamp(integerValuesHistogram.startTimeStampMsec);
          targetHistogram.setEndTimeStamp(integerValuesHistogram.endTimeStampMsec);
      }
docs: Copy this histogram into the target histogram, overwriting it's contents.
  
  @param targetHistogram the histogram to copy into