15:21:21 Write to Excel2007 format<br />15:21:21 File written to 33chartcreate-bar-stacked.xlsx<br />15:21:21 Peak memory usage: 4 MB<br />15:21:21 Done writing file<br />File has been created in /home/fasttech/gymbrain.fasttechsoft.com/vendor/phpoffice/phpexcel/Examples<br />