emacs -Q

Visit the attached SES file

Go to the last row that contains data.

Mark and copy the row to the kill ring (C-Spc Down Meta-w)

Press C-y to yank a new row. SES asks "Yank will insert 1 rows.
Continue? (y or n)". Press y.

The first cell of the new row is left-aligned. The cell it was copied
from is right-aligned.

Until recently, alignment was copied too.