resizableLabel(item, axis, sep, unit=NULL)"S", "C", "conductivity mS/cm",
"conductivity x or
y.getOption("oceUnitSep") is checked. If that exists, then it is
used agetOption("oceUnitBracket"), which may be "[" or "(".
Whether spaces are used between the unit and these deliminators is set by
psep or getOption("oceUnitSep").plot.ctd.