Estimates of pD as a function of dust from the DIRBE/IRAS map measured along the line of sight of SDSS red galaxies at 0.15 < z < 0.25 (left), 0.25 < z < 0.30 (middle) and 0.30 < z < 0.35 (right). The grey colour maps account for the density of sources. The red dots and error bars represent the median and standard deviation estimated through bootstrapping resampling of pD and D within the range 0.5 < D < 4.5 split in 20 bins of equal number of sources. The red line is a linear fit to the dots. We find p_LRG ~ 0.0238, 0.0232 and 0.0225 for 0.15 < z < 0.25, 0.25 < z < 0.30 and 0.30 < z < 0.35 respectively. The blue dashed line shows the p = 0.0184 derived by SFD98 using a CCMOD Milky Way absorption law and a local elliptical galaxy sample at (z < 0.05).