<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">\cals@span@height=20pt
\cals@span@put
\cals@span@height=40pt
\cals@span@put
\show\cals@spanq@heights
%
\cals@span@height=0pt
\cals@span@get
\show\cals@spanq@heights
\showthe\cals@span@height
</pre></body></html>