You can hardly see the double herringbone stitch.
In the first row it is rather narrow and of course I made a mistake.
I stitched without reading everything.
Sharon says: "On every second stitch, slide the needle under the cross bar
created by the first row of stitches.
This means that the second row of herringbone is woven
or interlaced through the first row as illustrated."
So my first row is not at all what it should be: the twisted lattice band
I had to make stem stitches not catching the fabric beneath. The effect
is interesting, too. So I did not unpick it.
The second row is the proper twisted lattice band (121).