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The transverse size of q q-bar fluctuations of a longitudinally polarizedphoton is reduced relative to the transerve size of q q-bar fluctuation of atransversely polarized photon. This implies a model-independent prediction ofthe ratio R(W2,Q2)=sigma_L/sigma_T=0.375, or, equivalently, F_L/F_2=0.27, forx=Q2/W2<<1 and Q2 sufficiently large, while R(W2,Q2)=0.50, if this effect isignored. Experimental data from HERA confirm the transverse-size reduction.

The Color Dipole Picture and the Ratio of the Longitudinal to the Transverse Photoabsorption Cross Section