I worked 10 extra rows in the garter stitch section, ending up with 334 stitches, and 499 once the border was established.
Unblocked, the shawl measured 11.5” deep and 25.5” from edge to edge across the back of the neck; blocked, it measures 13” by 28”.
Take heed of Paula’s warning about the ring markers!

(The pictures don’t quite capture the subtle blues and greys of the yarn.)