code: def plot_bhist(samples, file_type, **plot_args):
      
  
      all_x = set()
      for item in sorted(chain(*[samples[sample]['data'].items()
                                  for sample in samples])):
          all_x.add(item[0])
  
      columns_to_plot = {
          'GC': {
              1: 'C',
              2: 'G',
          },
          'AT': {
              0: 'A',
              3: 'T',
          },
          'N': {
              4: 'N'
          },
      }
      nucleotide_data = []
      for column_type in columns_to_plot:
          nucleotide_data.append(
              {
                  sample+'.'+column_name: {
                      x: samples[sample]['data'][x][column]*100 if x in samples[sample]['data'] else 0
                      for x in all_x
              }
              for sample in samples
              for column, column_name in columns_to_plot[column_type].items()
          }
      )
  
      plot_params = {
              'id': 'bbmap-' + file_type + '_plot',
              'title': 'BBTools: ' + plot_args['plot_title'],
              'xlab': 'Read position',
              'ymin': 0,
              'ymax': 100,
              'data_labels': [
                  {'name': 'Percentage of G+C bases'},
                  {'name': 'Percentage of A+T bases'},
                  {'name': 'Percentage of N bases'},
              ]
      }
      plot_params.update(plot_args['plot_params'])
      plot = linegraph.plot(
          nucleotide_data,
          plot_params
      )
  
      return plot
docs: Create line graph plot of histogram data for BBMap 'bhist' output.
  
      The 'samples' parameter could be from the bbmap mod_data dictionary:
      samples = bbmap.MultiqcModule.mod_data[file_type]