Plotting the logarithm R(G)/N-c(1/2) as a function of the logarithm of the number of the blobs of the chain, N/N-c, one obtains straight lines according to an equation derived from the blob theory (R(G) is the radius of gyration of a polymer containing N statistical segments and N-c is the number of statistical segments of which one blob consists and which depends only on the quality of the solvent). Extrapolating these straight lines, obtained with different linear polymers dissolved in different solvents, to log(N/N-c) = 0 or N = N-c one obtains the expansion of the chains in the interior of the blob (R(G)/N-c(1/2))(b). This expansion is found, for a given polymer, to be the same as the expansion of this polymer in Theta conditions R(G0)/N-1/2. This result indicates that the chain inside the blob obeys Gaussian statistics.