Binned radial y_c profile of Virgo outskirts. The bins are 30 pixels wide (or equivalently 33′, or 230 kpc). The two dashed lines correspond to the expected signal from two analytical models where the electron density beyond 0.5 Mpc falls as r^-1 or r^-1.2. At r = 0.5 Mpc the model is normalized to the electron density given by G04 at that distance. At distances smaller than 0.5 Mpc the electron density follows the model of G04. The solid line shows the profile of the simulated Virgo cluster. The inset shows the corresponding profile in the ROSAT map using the same bins (with units the same as in Fig. 13).