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It was shown recently [1] that the structural -relaxation time of supercooled o-terphenyl depends on a single control parameter , which is the product of a function of density $E(\rho )$ , by the inverse temperature T -1. We extend this finding to other fragile glassforming liquids using light scattering data. Available experimental results do not allow to discriminate between several analytical forms of the function $E(\rho )$ , the scaling arising from the separation of density and temperature in . We also propose a simple form for $\tau (\Gamma )$ , which depends only on three material-dependent parameters, reproducing relaxation times over 12 orders of magnitude.