%
% 0pt
%
> \tmp=macro:
->{100pt}{2pt}{4pt}{0pt}.
> \ll=macro:
->100pt.
> \dl=macro:
->2pt.
> \dr=macro:
->4pt.
> \w=macro:
->0pt.
%
% \relax
%
> \tmp=macro:
->{200pt}{2pt}{4pt}\relax .
> \ll=macro:
->200pt.
> \dl=macro:
->2pt.
> \dr=macro:
->4pt.
> \w=\relax.
%
% User-specified
%
> \tmp=macro:
->{300pt}{0pt}{0pt}{3pt}.
> \ll=macro:
->300pt.
> \dl=macro:
->0pt.
> \dr=macro:
->0pt.
> \w=macro:
->3pt.