DriftingGratings.get_response() does not explain what the ncells+1'th response corresponds to

[HDictus]

Describe the bug
A DriftingGratings object has a .cell_ids attribute and a get_response method. The documentation for get_response states that it returns an array of the form (num_orientations, num_temporal_frequencies, num_cells, 3) when in fact it returns (num_orientations, num_temporal_frequencies, num_cells+1, 3) . This is confusing.

Do you want to work on this issue?
Are you willing and able to fix this bug? If so, let us know here (and see the guide). Thank you!

Yep, I'm happy to do it.