Epson 10600 - Manual (Page 138)

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Maintaining and Transporting the Printer | 5-9
14. When done performing the adjustment in Uni-D (uni-directional)
mode, as described above, you should repeat it in Bi-D mode (select
ALIGNMENT = Bi-D ALL ). The process is exactly the same, but the
printed pattern is different:
To select the best pattern, use an eye loupe to determine which block has
the smallest gaps. In the example shown above, number 8 has the
smallest gaps.
Note
If you’re performing a
Bi-D ALL adjustment, it’s
important to perform the
Uni-D adjustment first.
Number 8 is the best choice