Interpreting a Stress - Strain Curve

Hi all

I was wondering if someone could help shed some light on interpreting a stress strain curve (attached).

It appears that two timber types (soft and hard wood) were loaded parallel and perpendicular to the grain and the stress strain curve produced.

I am trying to make sense of it.

So far i can say that:

loading parallel to the grain for both wood types results in a steeper stress/strain curve thus the young's modulus is greater when loading parallel to the grain, thus the material is stiffer.

I was struggling to make any more sense out of it and i was wondering i could get the opinions of the community?

Thank you.

Yes, rated stress of wood is dependent on loading direction relative to grain. Loading perpendicular to grain will cause separate.

Also, the stress strain curve is incomplete.