19:36:11 Write to Excel2007 format<br />19:36:11 File written to 33chartcreate-column-2.xlsx<br />19:36:11 Peak memory usage: 4 MB<br />19:36:11 Done writing file<br />File has been created in /home/hycmvsgn/heal.co.ke/invoices/vendor/phpoffice/phpexcel/Examples<br />