+do pass <tt>--log=test.thres:error</tt>:
+
+\section GRAS_tut_tour_logs_config_layout Choosing how things get displayed
+
+As with SimGrid 3.3, it is also possible to change how each and every
+message get displayed from the command line without even recompiling
+your code. This is done by changing the <tt>fmt</tt> field of the
+category you want to change. The value of this field is somehow
+similar to printf's format strings, with several existing specifiers.
+
+For example, if you just want the message you passed to the macro
+without any decoration about the host which raised it, its pid and
+everything, just pass <tt>--log=test.fmt:%m</tt>:
+\include 06-logs.output.fmt
+
+For debuging purpose, you can even ask to get the backtrace at each
+execution point:
+\include 06-logs.output.fmt-bt
+