This example has multiple sizes and can be a bit confusing. The numbers in parenthesis (brackets) reflect alternate sizes.
The yellow highlighted instruction would read:
Size 1:
(1-9-4) Increase 1 stitch every 9 rows 4 times
Size 2:
(1-9-0) Increase 1 stitch every 9 rows 0 times
Size3:
(1-9-0) Increase 1 stitch every 9 rows 0 times
In other words, size 2 and 3 only use the first 3 lines of the shaping instructions.