Question about CWM.m output parameters

Hi, I've been trying to understand what the output parameters of the function CWM.m mean (https://github.com/CSAILVision/LabelMeToolbox/blob/master/features/CWM.m) but I can't find any documentation. I also ran the code to see if the result helped me understand but it didn't. Could you help me understand what [fv,p,mx,Cx,Cy,b] are? Thanks a lot!