CHART NOTE
When working from the chart, if there are insufficient stitches to work a full cable at row-end edges, work these stitches in stocking stitch instead.
BACK
Using 5mm needles, cast on 85 (91:99:107:115:123:131:141:149) sts.
Beg and ending rows as indicated, now work in patt from Chart as folls:
Work chart rows 1 to 18, ending with RS facing for next row.
Change to 6mm needles.
Now repeating chart rows 19 to 90 throughout, cont as folls:
Cont straight until Back measures 30 (31:31½:32:32½:33:33:34:34) cm, ending with RS facing for next row.
SHAPE ARMHOLES
Keeping patt correct, cast off 4 sts at beg of next