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The transverse size of q q-bar fluctuations of the longitudinal photon isreduced relative to the transverse size of q q-bar fluctuations of thetransverse photon. This implies R(W2, Q2) = 0.375 or, equivalently, FL/F2 =0.27 at x<<0.1 and Q2 sufficiently large, while R(W2, Q2) = 0.5, if this effectis not taken into account. Forthcoming experimental data from HERA will allowto test this prediction.

The Color Dipole Picture and the ratio of R(W, Q) = sigma L/sigma T