rect.setAttributeNS(null, 'height', 1);
} else if (scores[i] > 0) {
color = [0.2, 0.4, 0.8];
rect.setAttributeNS(null, 'y', base_y - extent);
rect.setAttributeNS(null, 'height', 1);
} else if (scores[i] > 0) {
color = [0.2, 0.4, 0.8];
rect.setAttributeNS(null, 'y', base_y - extent);