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F_UDSI(f,t,1)=C_UDSI(F_C0(f,t),t->t0,1);
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c0 = F_C0(f,t);
t0 = THREAD_T0(t);
F_CENTROID(xf,f,t);
C_CENTROID(dr0,c0,t0);
NV_VV(dr1,=,xf,-,dr0);
F_UDSI(f,t,1) = C_UDSI(c0,t0,1) + (C_UDSI_G(c0,t0,1)[0]*dr1[0]);
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longma135

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