+ upper_white_space + middle_white_space
+ lower_white_space);
JScrollBar y_scroller = new JScrollBar(JScrollBar.VERTICAL);
seqmap.setOffsetScroller(y_scroller);
xzoomer = new AdjustableJSlider(Adjustable.HORIZONTAL);
xzoomer.setBackground(Color.white);
yzoomer = new AdjustableJSlider(Adjustable.VERTICAL);
yzoomer.setBackground(Color.white);
seqmap.setZoomer(NeoMap.X, xzoomer);
seqmap.setZoomer(NeoMap.Y, yzoomer);