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Deregowski 1981 thoroughly described the
elliptic DMO operator; I include Figure (1) only
for the sake of introducing the terminology used throughout
this paper.

**Shape
**

Figure 1 The DMO operator (bold line)
is geometrically constructed from the elliptical reflector
corresponding to an impulse in a (time, midpoint) section.
Notice that in the (*t*_{0},*x*) space, the maximum slope is 2/*v*.

The operator is a dip-limited ellipse whose support is given by
the equation

| |
(1) |

Because it is kinematically impossible to have reflectors dipping more than
the slope 2/*v* in a zero-offset constant-velocity time section,
the DMO operator is dip-limited.

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Stanford Exploration Project

11/17/1997