Deconvolved PP and PS VSP images from rig source VSP, in same PP twt scale, with corridor stack from second vibrator source near the vertical of Total Depth. Note the intense lateral variations from heterogeneous reflectors between 1.05 s to 1.2 s (Top Dogger), These heterogeneities located right above the Dogger reservoir platform alter the lateral frequency content of the Dogger interval reflections, thus may bias the results of fine reservoir studies and reduce their resolution. Figure modified from Figure 9 of Mougenot et al. p. 464 [2].