R0, R1, R2 width algorithm

The width algorithm in this case is similar except that the addition of R₂ extends the validity of the width estimates to weak signals. In this case the variance is:

V a r i a n c e = \frac{2}{3} \ln [\frac{| R_{1} |}{| R_{2} |}]

The output width W is defined as in R0, R1 width algorithm.