inconsistant function in Sim3Solver

[ns15417]

Hi , I found that there are two functions in Sim3Solver, FromCameraToImage() and Project()
In these two functions, mfbeta is used in this functions,like:
const float x = xc / (mfAlpha*imd + (1-mfAlpha)*zc); const float y = yc / (mfbeta*imd + (1-mfAlpha)*zc);
I thought it should be mfAlpha here. So is this a mistake or intentional?