Vendor/phpspreadsheet/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Chart/GridLines.php
public function setSoftEdgesSize($size)
    {
        if ($size !== null) {
            $this->activateObject();
            $softEdges['size'] = (string) $this->getExcelPointsWidth($size);
        }
    }
public function setSoftEdgesSize($size)
    {
        if ($size !== null) {
            $this->activateObject();
            $softEdges['size'] = (string) $this->getExcelPointsWidth($size);
        }
    }
Set Soft Edges Size.

@param float $size