> \cals@spanq@heights=macro:
->.
> \cals@spanq@heights=macro:
->{20.0pt}.
> \cals@spanq@heights=macro:
->{20.0pt}.
%
> 40.0pt.
> 0.0pt.
> \cals@spanq@heights=macro:
->{20.0pt}.
> 20.0pt.
> \cals@spanq@heights=macro:
->.
