Strange. If I try use fits.get_data() in a jupyter notebook it works like a charm but if I want to use it within a function in a python-file it breaks.
However I got the following code working with your fits-file by surpassing the get_data() function:
link_to_gist 10
The code is usually straight forward. If you have any questions regarding the functions feel free to ask.
The output I got seems pretty similar to your uploaded image: