Basically followed my project notes from here.

• Cast on 104, 9 rows: sl1, 2x2 ribbing until last stitch, k1bl.
• Row 10: sl 1, m1, continue 2x2 ribbing until last stitch, m1, k1bl.
• 21.5 pattern repeats, with a sl 1, k1 selvedge
• Next row: sl1, k2tog, 2x2 ribbing until last 3 stitches, k2tog, k1bl.
• 9 more rows of 2x2 ribbing the same as the starting border.

The skeins both weighed in slightly heaver than 100 grams (~105 grams) and the finished product weighed exactly 200 grams. (on my scale at least) Unblocked dimensions were 64” x 14’. Blocked dimensions are 86” by 15.5”