diff --git a/chapter3/hough_lines.py b/chapter3/hough_lines.py
index b5503fc..1abbb98 100644
--- a/chapter3/hough_lines.py
+++ b/chapter3/hough_lines.py
@@ -7,7 +7,8 @@
 minLineLength = 20
 maxLineGap = 5
 lines = cv2.HoughLinesP(edges,1,np.pi/180,20,minLineLength,maxLineGap)
-for x1,y1,x2,y2 in lines[0]:
+lines = lines[:,0,:]
+for x1,y1,x2,y2 in lines:
   cv2.line(img,(x1,y1),(x2,y2),(0,255,0),2)
 
 cv2.imshow("edges", edges)
diff --git a/chapter3/planets_circles.jpg b/chapter3/planets_circles.jpg
index 9b0fb43..a2abe00 100644
Binary files a/chapter3/planets_circles.jpg and b/chapter3/planets_circles.jpg differ
diff --git a/chapter3/skin.jpg b/chapter3/skin.jpg
index de692b6..cbfbf0a 100644
Binary files a/chapter3/skin.jpg and b/chapter3/skin.jpg differ