I was recently suggested the POWER (https://git.ncsa.illinois.edu/elihu/Gravitational_Waveform_Extractor/) code for some GW extrapolation work I was doing by Gabriele Bozzola but I believe I found some bugs and he suggested I send an email here.

Running the script as is on the GW150914 gallery example gives me results significantly different from what the plots on the ET website show. I found replacing where the code currently fits the strain amplitude and phase to a polynomial expression with numpy polyfit seems to fix the main problem.

I also noticed in the getCutoffFrequencyFromTwoPuncturesBBH function, lines 341 - 347 have an incorrect equation for angular momentum, it looks like a typo between position and momentum. Right now its position *  momentum - momentum^2.  

I'm not sure if this code is being actively used, but I saw there were git branches for the latest ET release.

Thanks,

Anuj Kankani