>>-.---.----.----SOURCETABSTOP-"number"-.---->< +-/-+ +-NO-SOURCETABSTOP----------+
| number | A number between 1-255 | 
| Default: | SOURCETABSTOP"4" (IDE default) or SOURCETABSTOP"8" (command line default) | 
| Phase: | Syntax check | 
| $SET: | Initial | 
Setting NO-SOURCETABSTOP stops spaces being inserted when a tab is encountered. This is useful if you have embedded a tab in a literal and require the literal to retain the value x"09".
Visual Studio inserts tab characters when the tab key is pressed.