Steady-state heat transfer through a gas occurs between two parallel wal ls. The ex periment is conduct ed in such conditions that the only process by which the heat is transferred is pure thermal conduction. The dependence of the thermal conductivity coefficient `lambda` is measured as a function of the gas pressure `p`, with the experiment conducted twice, for two different distances between the walls. The results are shown in the figure. What curve corresponds to the greater distance between the walls?