solved it by :
limits = lift((x,y) -> FRect(to_value(x)[1], minimum(to_value(y1))-2, (to_value(x)[end]-to_value(x)[1])+5, maximum(to_value(y1))+5),x,y1)
plot1=lines!(scene, x, y1,limits=limits)
thank you my self 
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