starlevels(levelslist) overrides the default thresholds and
symbols for "significance stars". For instance,
starlevels(+ 0.10 * 0.05)
sets the following thresholds: + for p<.10 and * for
p<.05. Note that the thresholds must lie in the (0,1] interval and must be
specified in descending order. To, for example, denote insignificant results, type
starlevels(* 1 "" 0.05) .

stardetach specifies that a delimiter be placed between the statistics
and the significance stars (i.e. that the stars are to be displayed in their
own column).