private function writeCols(XMLWriter $objWriter, PhpspreadsheetWorksheet $pSheet)
    {
        // cols
        if (count($pSheet->getColumnDimensions()) > 0) {
            $objWriter->startElement('cols');

            $pSheet->calculateColumnWidths();

            // Loop through column dimensions
            foreach ($pSheet->getColumnDimensions() as $colDimension) {
                // col
                $objWriter->startElement('col');
                $objWriter->writeAttribute('min', Coordinate::columnIndexFromString($colDimension->getColumnIndex()));
                $objWriter->writeAttribute('max', Coordinate::columnIndexFromString($colDimension->getColumnIndex()));

                if ($colDimension->getWidth() < 0) {
                    // No width set, apply default of 10
                    $objWriter->writeAttribute('width', '9.10');
                } else {
                    // Width set
                    $objWriter->writeAttribute('width', StringHelper::formatNumber($colDimension->getWidth()));
                }

                // Column visibility
                if ($colDimension->getVisible() == false) {
                    $objWriter->writeAttribute('hidden', 'true');
                }

                // Auto size?
                if ($colDimension->getAutoSize()) {
                    $objWriter->writeAttribute('bestFit', 'true');
                }

                // Custom width?
                if ($colDimension->getWidth() != $pSheet->getDefaultColumnDimension()->getWidth()) {
                    $objWriter->writeAttribute('customWidth', 'true');
                }

                // Collapsed
                if ($colDimension->getCollapsed() == true) {
                    $objWriter->writeAttribute('collapsed', 'true');
                }

                // Outline level
                if ($colDimension->getOutlineLevel() > 0) {
                    $objWriter->writeAttribute('outlineLevel', $colDimension->getOutlineLevel());
                }

                // Style
                $objWriter->writeAttribute('style', $colDimension->getXfIndex());

                $objWriter->endElement();
            }

            $objWriter->endElement();
        }
    }