Zeros of a Graph

[ORoxo]

Hey, guys,

I have the graph below and would like to find an easy way to get the zeros (interceptions of the X axis). Is there any way to know it?

I have the data but there's no specific value for 0. How can I extract it?

Thanks,
ORoxo

 

[Haluk]

Can you check the link below ?

https://answers.yahoo.com/question/index?qid=20100214211616AA1weI0

 

[ORoxo]

Can you check the link below ?

https://answers.yahoo.com/question/index?qid=20100214211616AA1weI0

The thing is, I don't have two sets of data. This is basically the output of a straddle strategy (so sum of X and Y which gives the payoff). The only data plotted in the graph is the payoff.