Thanks to Frank for his definitave source. This proper format can be achieved in
MSWord with a bit of effort. Here is how to do it.
1 They NA in the font required for the A portion. This would usually be the body
2 Highlight the N and set the font size to half the body font size.
3 Select Format, Font, Character Spacing.
4 Select in Position Raised and (by trial and error) setect the amount in points.
This will be about 1/4 the body font size.
Of course all this depends on your screen and printer. You may have to play about.
I think the cause of the variations are ignoorance or laziness.
Why is it in discussing the variations no one mentioned the Ds. D1 D2 D3 and D4