* Create a new CTWorksheet instance with all values set to defaults
*
* @return a new instance
*/
private static CTWorksheet newSheet(){
CTWorksheet worksheet = CTWorksheet.Factory.newInstance();
CTSheetFormatPr ctFormat = worksheet.addNewSheetFormatPr();
ctFormat.setDefaultRowHeight(15.0);
CTSheetView ctView = worksheet.addNewSheetViews().addNewSheetView();
ctView.setWorkbookViewId(0);
worksheet.addNewDimension().setRef("A1");
worksheet.addNewSheetData();
CTPageMargins ctMargins = worksheet.addNewPageMargins();
ctMargins.setBottom(0.75);
ctMargins.setFooter(0.3);
ctMargins.setHeader(0.3);
ctMargins.setLeft(0.7);
ctMargins.setRight(0.7);