The middle path is a path graph 3 graph of contraction. When the temperature increases in the value of carbon nitrile. contraction is increased, and when the temperature is approximately 850 fixed.
The graph is a graph of the middle third straight contraction. The increase in temperature carbonization the steep contraction is increased and fixed at a temperature of about 850.
Graph 3 straight central is a graph of the contraction. When the temperature increases in the carbonization shrinkage value will increase and start fixed when temperature about 850.