Syntax: YLABEL str

   Write the label "str" centered to the left of the yaxis made by BOX.
If you think that the label is badly positioned you can say things like
        YLABEL \raise500My Y-axis Label
(providing that you use TeX-style fonts, of course)

If the label is too tall it may overlap with the numerical tickmark
labels. If VERBOSE is one or more, you'll be warned about this, and
a suggested change to the plot LOCATION will be suggested. This moves
the entire plot; it is your responsibility to reset it later if appropriate.

   If EXPAND is exactly 1, and ANGLE is exactly 0, SM will attempt to
use a hardware character set. To avoid this use EXPAND 1.0001, or
preface the string with an explicit \r.