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The first order operator

The approximate operator with elements that are first order polynomials in the slowness has four new elements, these are anti-symmetric terms in the operator:

 \cos(\phi)/2 & & \sin(\phi)/2 ...
 ... p_x + b_3 p_y & & a_4 p_x + b_4 p_y & & 1/2\end{array}\right].\end{displaymath}

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