Top: Excerpt of the 85OR18 PSTM migrated section overlain with the VSP image below GGR5-deviated well section trajectory, with fault F1 underlined. Bottom: Same PSTM section overlain with unmigrated stack section below GGR5 well trajectory and fault F1 seen by the VSP. The migration smearing tends to smooth out the small step fault F1 on deep Rhetien level, near top basement. Figure modified from report presentation and .tiff stack section display of Vicelli et al. [16].