code: def _lowerAsn(asnfile):
      
      # Start by creating a new name for the ASN table
      _indx = asnfile.find('_asn.fits')
      _new_asn = asnfile[:_indx]+'_pipeline'+asnfile[_indx:]
      if os.path.exists(_new_asn):
          os.remove(_new_asn)
      # copy original ASN table to new table
      shutil.copy(asnfile,_new_asn)
  
      # Open up the new copy and convert all MEMNAME's to lower-case
      fasn = fits.open(_new_asn, mode='update', memmap=False)
      for i in range(len(fasn[1].data)):
          fasn[1].data[i].setfield('MEMNAME',fasn[1].data[i].field('MEMNAME').lower())
      fasn.close()
  
      return _new_asn
docs: Create a copy of the original asn file and change
          the case of all members to lower-case.