Hi, In the section entitled *Code Blocks in Babel* on the [[ http://orgmode.org/worg/org-contrib/babel/intro.php][Worg Babel Intro page]], it is listed that there are =header-arguments=, which can be added to a src block to control its evaluation and output. It then provides a link to a [[http://orgmode.org/worg/org-contrib/babel/reference.php][HeaderArguments]] page for more details, however this link appears to be broken - I get a *404 Error* when trying to load the page. Chris