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@@ -345,7 +345,7 @@ ufo_anka_backproject_task_process (UfoTask *task,
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index = priv->count % BURST;
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tomo_angle = priv->tomo_angle > -G_MAXFLOAT ? priv->tomo_angle :
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priv->overall_angle * priv->count / priv->num_projections;
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- norm_factor = priv->overall_angle / priv->num_projections;
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+ norm_factor = fabs (priv->overall_angle) / priv->num_projections;
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priv->sines[index] = sin (tomo_angle);
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priv->cosines[index] = cos (tomo_angle);
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x_region[0] = (gfloat) EXTRACT_INT (priv->x_region, 0);
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