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If you don't want to connect a line to a data point whose value is null, you must set Null ( or nothing ) instead of 0 in the Data Object.

{"Year":"2002", "Price":24.93},
{"Year":"2003", "Price":28.9},
{"Year":"2004", "Price":37.73},
{"Year":"2005", "Price":53.39},
{"Year":"2006", "Price":64.29},
{"Year":"2007", "Price":71.12},
{"Year":"2008", "Price":Null},
{"Year":"2009", "Price":Null},
{"Year":"2010", "Price":79.04},
{"Year":"2011", "Price":104.01},
{"Year":"2012", "Price":105.01},
{"Year":"2013", "Price":104.08}

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