code: def export_theta(ckout, data):
      
      cns_file = chromhacks.bed_to_standardonly(ckout["cns"], data, headers="chromosome")
      cnr_file = chromhacks.bed_to_standardonly(ckout["cnr"], data, headers="chromosome")
      out_file = "%s-theta.input" % utils.splitext_plus(cns_file)[0]
      if not utils.file_exists(out_file):
          with file_transaction(data, out_file) as tx_out_file:
              cmd = [_get_cmd(), "export", "theta", cns_file, cnr_file, "-o", tx_out_file]
              do.run(_prep_cmd(cmd, tx_out_file), "Export CNVkit calls as inputs for TheTA2")
      ckout["theta_input"] = out_file
      return ckout
docs: Provide updated set of data with export information for TheTA2 input.