Canon MG7100 series Online Manual page 201

Note
If it is difficult to pick the best pattern, pick the setting that produces the least
noticeable vertical streaks.
(A) Least noticeable vertical streaks
(B) Most noticeable vertical streaks
(2) Repeat the same procedure until you finish inputting the pattern number
for columns B to H, then tap OK.
For columns G and H, pick the setting that produces the least noticeable horizontal
streaks at the position indicated by an arrow.
Note
If it is difficult to pick the best pattern, pick the setting that produces the least
noticeable horizontal streaks.
(C) Least noticeable horizontal streaks
(D) Most noticeable horizontal streaks
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