\setlength{\cals@paddingL}{12pt}
\setlength{\cals@paddingR}{13pt}
\setlength{\cals@paddingT}{14pt}
\setlength{\cals@paddingB}{15pt}

\setlength{\cals@paddingD}{1pt}
\setlength{\baselineskip}{10pt}

\setbox\cals@current@row=\hbox{}

\cals@span@width=100pt
\cals@span@height=30pt

\spancontent{\noindent \vrule height3pt depth2pt width1pt}
\showbox\cals@current@row