Hi, When I execute plot_circular_hough_transform.py it gives the following error: Traceback (most recent call last): File "plot_circular_hough_transform.py", line 69, in <module> image[cy, cx] = (220, 20, 20) IndexError: index 102 is out of bounds for axis 0 with size 95 I am at version skimage 0.8.2, Python 2.7.2+, os: Linux Mint 12 Lisa. Could you please help me execute this? Please let me know if you need more information about my execution environment. Thank you. Ravi