How to calculate annotation SOR?

Hi,

After reading annotation documentation, I still couldn't get calculation of SOR. Do you set R or (R + 1/R) or refRation/altRatio as value of annotation? Can you give me an example with numbers? What happens when matrix is [3,0,3,0] ? (3 ref forward and 3 alt forward). R = (30) / (03) = 0/0 ?

Thanks,