code: def convert_sed_cols(tab):
      
      # Update Column names
      for colname in list(tab.columns.keys()):
  
          newname = colname.lower()
          newname = newname.replace('dfde', 'dnde')
  
          if tab.columns[colname].name == newname:
              continue
  
          tab.columns[colname].name = newname
  
      return tab
docs: Cast SED column names to lowercase.