Proton and deuteron F{sub 2} structure function at low Q{sup 2}

Measurements of the proton and deuteron F{sub 2} structure functions are presented. The data, taken at Jefferson Lab Hall C, span the four-momentum transfer range 0.06structure function is in good agreement with a parametrization of F{sub 2} based on data that have been taken at much higher values of Q{sup 2} or much lower values of x, and which are constrained by data at the photon point. The ratio of the deuteron and proton structure functions at low x remains well described by a logarithmic dependence on Q{sup 2} at low Q{sup 2}.