code: public void removeDataSerieFromHistogram(String histogramID, int index) {
          if (this.histograms.containsKey(histogramID)) {
              this.histograms.get(histogramID).removeSeries(index);
          }
      }
docs: Deletes a certain series of data from the histogram.
  The index will be the order of the histogram.
  
  @param histogramID
  @param index - the index of the data