Understanding Charpy Impact Test Results: Determining T1 and T2 Temperatures

[invincible1]

hey guys i need help charpy impact test. i have attached my graph with the results we had. Does this seem correct? from the graph how do i determine the transition temperature T1 for the material where T1 is normally defined as the temperature corresponding to 50% of energy change between the upper and lower plateaux of the energy curve
and also determine a temperature T2 corresponding to 50% crystallinity change.
Please help

 

[phydis]

in energy curve, it should be increasing, but it doesn't with your values, anyway it seems that the transition is gradual for that material, so it's quite difficult to determine the transition temperature.