java - weka ROC chart cannot be differentiated -

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i using knowledge flow compare between roc curves of different algorithm in weka gui knowledge flow.

i have installed jfreechart not seem have effect.

enter image description here

the sample of roc image here.

firstly, not understand why on right hand side there duplicates symbols example j48 appearing twice. roc curve obtained selecting image model performance chart.

is there possible way me extract roc curves plotted on graph or other clearer apis me use effectively.

secondly, knowledge flow diagram.

i using training , test set.

enter image description here


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