Rectangles: (5 entries)
  0: Rectangle: x1=0, y1=0, x2=0, y2=0
  1: Rectangle: x1=291, y1=504, x2=363, y2=576
  2: Rectangle: x1=377, y1=646, x2=474, y2=743
  3: Rectangle: x1=463, y1=793, x2=585, y2=916
  4: Rectangle: x1=521, y1=901, x2=659, y2=1039