code: def freqpoly_plot(data):
          
          rel_data = OrderedDict()
          for key, val in data.items():
              tot = sum(val.values(), 0)
              rel_data[key] = {k: v / tot for k, v in val.items()}
          fplotconfig = {
              'data_labels': [
                  {'name': 'Absolute', 'ylab': 'Frequency', 'xlab': 'Merged Read Length'},
                  {'name': 'Relative', 'ylab': 'Relative Frequency', 'xlab': 'Merged Read Length'}
                  ],
              'id': 'flash_freqpoly_plot', 'title': 'FLASh: Frequency of merged read lengths',
              'colors': dict(zip(data.keys(), MultiqcModule.get_colors(len(data))))
              }
          return linegraph.plot([data, rel_data], fplotconfig)
docs: make freqpoly plot of merged read lengths