Example given...

T= 100°F || 200°F
---------------------------
S= 20.0 kpsi || 15.0 kpsi

To find S at 150°F, CAESAR II would use linear interpolation and arrive at 17.5 kpsi

However the code may give the following data because test data showed a slightly non-linear behavior between 100 and 200°F.

T= 100°F || 150°F || 200°F
-------------------------------------
S= 20.0 kpsi || 17.7 kpsi || 15.0 kpsi