OLL2 (a center dot)

F (R U R’ U’) S (R U R’ U’) f’ (bar on L-face)

f (U R U’ R’) S’ (U R U’ R’) F’ (bar on R-face)

After F2L completed, one of these algorithm is used depending on the U face direction. Then, you can avoid 2-quarter turn!

Also, these are reverse procedures, so it is easy to memorize them.