Dictionary:Bathtub chart
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{{#category_index:B|bathtub chart}}
A wavefront chart displaying the loci of reflection times where the source-geophone offset is not zero (see Figure A-15). The loci are called aplanatic surfaces, and for constant velocity, they are ellipses with source and geophone at the foci. A reflector tangent anywhere to one of the curves satisfies the reflection time for that curve.
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