Here's a pic of yarn before steaming:
and of a second bit of yarn after steaming:
and the same yarn used as weft for weaving a sample:
[caption id="attachment_2887" align="alignnone" width="640"]
In the weaving, the warp yarn was spun to about the same spinning angle, and the same thickness, only in the other direction. (Again - hitting an exact angle and keeping to exactly that angle is really hard, and there will always be digressions.)
So. Can you see differences?