Measurement of the ratio of W+c-jet over W+jet production
for Et(jet)>20 GeV and |eta(jet)|<2.5.

Value: 0.074 +/- 0.019 (stat.) +0.012-0.014 (syst.)

The prediction of ALpgen is 0.044+/- 0.003 according to the same paper
(arXiv:0803.2259)

The measurement is also presented in three bins of jet ET.