public function getStaticValues(array $cells)
    {
        $result = [];
        foreach ($this->fieldsMap as $cellIndex => $info) {
            if ($info['kind'] === 'staticHeader') {
                $fieldName = $info['staticHeaderName'];
                $result[$fieldName] = isset($cells[$cellIndex]) ? $cells[$cellIndex] : '';
            }
        }

        return $result;
    }