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Re:Tinychart – simple, ready-to-go charts by moklick on Friday February 13, 2015 @11:13AM (#9045042)
Maybe http://metricsgraphicsjs.org/ could help you with this.
Re:Tinychart – simple, ready-to-go charts by sjs382 on Friday February 13, 2015 @12:56PM (#9045769)
Hrm, one of the requirements that I forgot to mention (but might be implied by the example?) is that the are 4 different data sets on the graph, all with different different intervals.