<t>QuoteOriginally posted by: mihailGood morning,vols on a RR are taken from the corresponding calls and puts.the formula for 1 year is 1yr EURCZK 25dta Call vol - 1yr EURCZK 25dta Put vol.eg, 1yr EURCZK 25dta Call vol spot = 4.871yr EURCZK 25dta Put vol spot = 4.57This gives you a 0.30Call 25DRRYou...