def write_errors(self, value, errors):
        """
        // Writes Error[]

        T[] {
            varint length;
            T* items;
        }

        Error {
            varint error_label;
            float error_minus;
            float error_plus;
        }
        """

        t = get_current_transaction()
        t.write(self.fp_records, varint_format(len(errors)))
        for error in errors:
            error_label_str = error.get('label', '')

            if 'asymerror' in error:
                error_minus = error_to_float(value, error['asymerror']['minus'])
                error_plus = error_to_float(value, error['asymerror']['plus'])
            else:
                error_minus = error_plus = error_to_float(value, error['symerror'])

            error_label = self.string_dict.id_for_str(error_label_str)
            t.write(self.fp_records, varint_format(error_label))
            t.write(self.fp_records, struct.pack('<ff',
                                                 error_minus, error_plus))
    def write_group_header(self, metadata, num_records):
        t = get_current_transaction()

        t.write(self.fp_records, varint_format(metadata.inspire_record))
        t.write(self.fp_records, varint_format(metadata.table_num))
        t.write(self.fp_records, struct.pack('<ff', *metadata.cmenergies))
        t.write(self.fp_records, string_format(metadata.reaction))
        t.write(self.fp_records, string_format(metadata.observables))
        t.write(self.fp_records, string_format(metadata.var_y))

        t.write(self.fp_records, size_format(num_records))