"xscale"xscale-class.RdAn object of class "xscale" represents x-scale style.
fromA pos class, indicates the start point
postion of x-scale.
toA pos class, indicates the end point
postion of x-scale.
label"character" the label of x-scale
gpA "list" object, It will convert to an object of
class gpar. This is basically a list of graphical
parameter settings of x-scale.
drawA "logical" value indicating whether the x-scale
should be draw.