[Wannier] seek help

[Hongwei Wang]

Dear Wannier90 users
 I am a Ph. D student in the Key Laboratory of Quantum Information, University of Science and Technology of China. I am beginner in using the Wannier90 code, I can't well understand the Key word "guiding_centres". I wonder if you can tell me its physical picture and the situation in which we should use guiding_centres? In addition, I want to know how to set the Key word num_guide_cycles，num_no_guide_iter， conv_noise_amp，  conv_noise_num  reasonablely.
can you tell me some experience to set them. 
 Thanks for any of your help！

Sincerely,
Hongwei Wang