[Gnuplot-py-users] linewidth

Hello,

What is the equivalent in gnuplot-py to "plot XXX lw 5" ?
I couldn't find how to do change the linewidth...
I'm using this call currently :
 g.replot(Gnuplot.Data(dataset_content, title=fileName, with="step"))
But I couldn't append lw="5" or linewidth="5" to it.
And I haven't found how to change the width afterwards.

Thanks,
Xavier