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fp coeff_dx_m1_m1, coeff_dx_0_m1, coeff_dx_p1_m1, coeff_dx_p2_m1, coeff_dx_m1_0, coeff_dx_0_0, coeff_dx_p1_0, coeff_dx_p2_0, coeff_dx_m1_p1, coeff_dx_0_p1, coeff_dx_p1_p1, coeff_dx_p2_p1, coeff_dx_m1_p2, coeff_dx_0_p2, coeff_dx_p1_p2, coeff_dx_p2_p2;