I sometimes see strange behaviour with how dots are connected in lines 
graphics, see image below for example. I am using the interpolateNulls 
option in the graph shown below as each line has data points available at 
different x intercepts. 

There should be 4 lines in the graph below but as you can see because of 
the way the dots are connected it appears as though there are 7 lines (1 
appears as it should, the other 3 appear as double lines).

This sometimes happens to all the lines in a graph, sometimes to just a 
subset of them and sometimes the graph appears as it should with data 
points properly connected.

Any idea what causes this or how to fix?


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