1) Page S55, footnote. Add “This paper was first presented at the SEG 85th Annual International Meeting, which corresponds to two expanded abstracts” before “Manuscript received by the Editor 28 February 2015.” The corrected derivation from equation 29 to 35 (corresponding to points 4 and 5 below) is similar to that in one of the two abstracts: Tang, C., and G. A. McMechan, 2015, Time-shift multi-direction slowness vector for computing angle gathers from reverse-time migration — Part II: Conjugate relation, complex-valued extrapolation, and time shift: 85th Annual International Meeting, SEG, Expanded Abstracts, 4365–4369, doi: 10.1190/segam2015-5838618.1.

2) Page S58, right column....
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