Gnomonic projections of E_B−V maps obtained by extracting the region observed by CoRoT from the τ₃₅₃ maps of Planck. The four panels correspond to the CCD footprint for four runs: LRa01, LRa03, LRc01, and LRc02 as indicated on the figure. The colour scale is the same for all runs; the maximum value was arbitrarily set to 1.5 to allow for an easy comparison of the different panels.