docs: public Histogram<T> getHistogram( int numSigmas ) {
          Lock lock = this.getLock().writeLock();
          lock.lock();
          try {
              Histogram<T> hist = new Histogram<T>(this.math, this.values);
              if (numSigmas > 0) {
                  // The 'getMediaValue()' method will reset the current histogram, so don't set it...
                  hist.setStrategy(this.getMedianValue(), this.getStandardDeviation(), numSigmas);
              }
              this.histogram = hist;
              return this.histogram;
          } finally {
              lock.unlock();
          }
      }