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Nova Del 2013 pulsations

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MDP
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Moderator note: This topic was double posted.  Please visit http://www.aavso.org/nova-del-2013-pulsations-0 for further discussion of this topic.

Looking at the graphs, it seems to me that there is an up and down pulsation within the overall descending curve. Is this real, or a chance artifact? If real, what would cause it? Patrick McDonald (MDP) PS. If this is covered in another forum, please advise and accept my apologies.

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