Measuring the significance of galaxy M_J magnitude gradient towards filaments. A KS test is performed in order to asses the difference between galaxy mass distributions in different (logarithmic) d_fil bins. Colours indicate the logarithm of the p-value, i.e. the probability that the two compared samples are drawn from the same distribution (the actual value is also indicated in each square). Numbers on the diagonal indicate the number of galaxies in each corresponding bin. Plots are shown for the C1 configuration and for different S/N. The KS test is performed only for d_fil >  4 Mpc (except for the original field case).