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{{#category_index:C|corridor}} A short interval following the first arrival in an upgoing vertical seismic profile (VSP), time shifted to their two-way arrival times at the surface; this constitutes an outer corridor (usually no wider than 200–300 ms) and the remaining portions an inner corridor. The outer corridor is relatively free of upgoing multiples and these portions are stacked together to give a corridor stack. Surface multiples are reduced by vertical seismic profile deconvolution (q.v.). See Figure C-16.