# question about the frequency of Gabor filters

The Fourier transform of 2D Gabor filters is shown below:

F is the radial frequency of the Gabor functions. Another parameter Fm is denoted as highest central frequency. Fr is the constant frequency ratio.

My question is : 1. central frequency is radial frequency? 2. so , Fm is the largest value among values of F? 3. Is F a series with common ratio Fr ?

Thank you very much for any help.