code: def _set_column_names(dep, exp):
      
      colnames = exp['Experiment'].astype(str) + '_' + exp['Fraction'].astype(str)
      file2col = dict(zip(exp['Raw file'], colnames))
      _dep = dep.rename(columns=file2col)
      _dep.columns.name = 'Column Name'
      return _dep
docs: rename the columns in the dependent peptides table from
      the raw file to the corresponding {experiment}_{fraction}.
      :param dep: dependent peptides table.
      :param exp: experimental design table.