Add unit information to st object

See the units argument to stable(). Units can be passed either as name=value pairs or as a named list with st_args(). Units can alternatively be passed as an argument to stable() as a pre-formed, named list using st_args(). Passing as an argument this way will overwrite units specified with st_units(). It is recommended to use either st_units() or st_args() but not both.

st_units(x, ..., parens = TRUE)

Arguments

x	an stobject
...	named items of the form COL = unit or a named list of units
parens	if TRUE, parens will be added to any unit whose first character is not (