下面是使用Emacs的artist-mode绘制出的OSI七层模型，
#+BEGIN_SRC ditaa :file images/network01.png +-----------------------------+ | cRED Application | +-----------------------------+ | cPNK Presentation | +-----------------------------+ | cYEL Session | +-----------------------------+ | cBLU Transport | +-----------------------------+ | cGRE Network | +-----------------------------+ | c1AC DataLink | +-----------------------------+ | c1AB Physical | +-----------------------------+ #+END_SRC
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原文：http://lavenliu.blog.51cto.com/5060944/1627395