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Hi , I am trying to create a discontinuous line multi series line chart. However, the line is not formed when there are no atleast two continuous null values. With just one Null value, the result is a bubble not a line as expected. I am attaching a screenshot of the same. Here on the top i want to make the line go till the 11:00 and then next at bottom to start till next data point. However, on top the line stops at second data point and on lower line, its just a bubble. not a line as the next value is not null value. To feed in the data, I am using two arrays as follow $transport=array("20","20","15","20","15","20","20","20"); $transport1=array("5","5","10","5","10","5","5","5"); After this , there is a logic to only accept the value if its 20 or 10 in second array , else make it Null as follow if (($transport[$i])==20) { $set->addAttribute('value',round($transport[$i])); } similar goes for second line if (($transport1[$i])==10) { $set1->addAttribute('value',round($transport1[$i])); } Can someone please guide through his problem? Regards, Aman