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Initial and boundary conditions

Assuming the slowness around the source is constant s0, we can find following initial conditions:  
p(0,\theta,x_0) & = & -s_0\sin \...
 ...p_\theta(0,\theta,x_0) & = & -s_0\cos \theta.\end{array}\right.\end{displaymath} (6)
The boundary conditions on two sides of the model are simple. One can assume outgoing rays and use one-sided finite-differences.

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