The diagram shows the change \( x \) in the length of a thin uniform wire caused by the application of stress \( F \) at two different temperatures \( T_{1} \) and \( T_{2} \). The variations shown suggest that :
1
\( T_{1} > T_{2} \)
2
\( T_{1} < T_{2} \)
3
\( T_{1} = T_{2} \)
4
None of these.