Re: [Groff] A question about vertical indentation of displays

[Anton Shepelev]

>> Ted Harding:
>>
>>> If you are using ms macros, then there are two number registers
>>> to watch out for: \n[PD] "paragraph drop" and \n[DD] "display
>>> drop". \n[PD] defines how much vertical space will be inserted
>>> before starting a new paragraph. \n[DD] defines how much vertical
>>> space will be inserted before *and after* a display.
>>>
>>> So your .DE followed by .LP will insert \n[DD]+\n[PD] between
>>> the bottom of the display and the top of the new paragraph.
>>
>> Hello, Ted, and thank you for your reply. According to what you
>> have said, it is impossible to have the same vertical space before
>> and after a display unless the PD register be set to zero. It
>> doesn't seem quite right to me. Why the asymmetry?
>
> It is not an asymmetry. Rather, it is a symmetry (same space above
> and below the display, due to \n[DD]). The extra space is coming
> from the \n[PD] associated with .LP
>
> <...>

A big-big thanks for the detailed explanation.

Anton