I was wondering, can the calculation of the NLO cross section decrease the cross section (relative to the LO one)? or not? I am asking because I read here http://www.pa.msu.edu/~huston/Kfactor/Kfactor.pdf the following Which refers to Table 1 and cases where the K-factor appears to be less than "1". Do those cases belong to the not-oftenly increased cross section? Or is there something else that decreases the K-factor from >1 yet the NLO is relatively larger than LO ##\sigma##s?