score:0

set the max plot line value to any fixed number plots the plot line.

from then onwards the plot line will be visible. if the value of plot lines is very small compared to the scale then it may be tough. in this case go for a logarithmic scale. That will help.

yAxis:{
type: 'logarithmic'
}

updated your fiddle at http://jsfiddle.net/z6QXW/12/

hope this will help you


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