It returns rulers (axis)
rulerPlot(
ycoord,
listOfdfChromSize,
listOfdfChromSizeCenType,
fromZerotoMax,
rulerNumberSize,
rulerPosMod,
rulerPos,
ruler.tck,
lwd.chr
)y coords
list of all d.f chr size
only d.f. of this cen. type
intervals
font
modifier of pos.
pos. of ruler
tick size and orient.
axis