Sony SEG-2550 Operating Instructions Manual page 26

The addition of shadows to the inserted letters may make the
display of letters more effective, especially when inserting
white letters or figures into a light picture.
Set the SHADOW selector as follows.
Toadd a wide shadow: WIDE
Toadd anarowshadow: NARW
Noshadow: OFF
SHADOW
select
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merticniee Shadow effects