Fraction of red galaxies as a function of standardized density. In reading order: MBE, DEDICA, DTFE, kNN. The data is binned in 20 bins of width 0.25σ centered around the mean. The yellow region denotes the error in the calculated red fraction as determined from the Monte Carlo simulation. In all cases, a clear color-density relation can be seen. The MBE shows a clear dip in high density regions. DEDICA has such a dip in low density regions.