It returns rulers (axis)
rulerTitle(
xmnoNA,
ymnoNA,
chrSpacing,
yPosRulerTitle,
listOfdfChromSizeCenType,
MbUnit,
specialyTitle,
yTitle,
xPosRulerTitle,
rulerTitleSize
)
x coords
y coords
chr. spacing
only d.f. of this cen. type
intervals
modifier of pos.
pos. of ruler
font
font size
plot