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I downloaded this demonstration

The source code can be previewed here However, when I download the NB file, I cannot get access to this said code. All I can see is the output.

I'm obviously missing something.

Thanks for enlightening me about this

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marked as duplicate by halirutan, m_goldberg, Jens, RunnyKine, Yves Klett May 17 '14 at 7:22

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Double-click the brackets on the right side of the notebook to expand the hidden contents. – phosgene May 16 '14 at 21:45
@phosgene it works, thank you very much. – LeGrandDODOM May 16 '14 at 21:46
up vote 6 down vote accepted

Double-click on the cell bracket to expand it. The arrow on the bracket indicates that it is closed and can be expanded downwards.

enter image description here

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