\cals@paddingL=2pt \relax
\cals@paddingR=4pt \relax


\alignC
\showthe\cals@paddingL
\showthe\cals@paddingR

\alignR
\showthe\cals@paddingL
\showthe\cals@paddingR

\alignL
\showthe\cals@paddingL
\showthe\cals@paddingR