  We report on the extraction of the structure functions F_2 and Delta xF_3 =
xF_3(nu)-xF_3(nubar) from CCFR nu_mu-Fe and nubar_mu-Fe differential cross
sections. The extraction is performed in a physics model independent (PMI) way.
This first measurement of Delta xF_3, which is useful in testingmodels of heavy
charm production, is higher than current theoretical predictions. The ratio of
the F_2(PMI) values measured in nu_mu and nubar_mu scattering is in agreement
(within 5%) with the predictions of NLO PDFS using massive charm production
schemes, thus resolvin long-standing discrepancy between the two sets of data.
