Cryptic crossword clue
They're notarised correctly along the vertical axis 9

The most common and most likely answer to this crossword clue is the 9 letter word ORDINATES

O
R
D
I
N
A
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E
S

Buddy explains!

The straight part
We know that "the vertical axis" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case the vertical axis = ordinates.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does ORDINATES mean?

ORDINATES noun
  1. The second of the two terms by which a point is referred to, in a system of fixed rectilinear coordinate (Cartesian coordinate) axes.
  2. The vertical line representing an axis of a Cartesian coordinate system, on which the ordinate (sense above) is shown.
ORDINATES verb
  1. To ordain a priest, or consecrate a bishop
  2. To align a series of objects

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