docs: def colourblind2(i):
      '''
          another colour pallete from http://www.sron.nl/~pault/
          allegedly suitable for colour-blind folk
  
          SJ
      '''
  
      hexcols = ['#332288', '#88CCEE', '#44AA99', '#117733', '#999933', '#DDCC77',
                 '#CC6677', '#882255', '#AA4499']
      idx = sc.mod(i,len(hexcols))
      return hexcols[idx]