Example of the reddening effect on a linear C3. The unreddened C3 (solid line) is moved up if the slope of the reddening vector (mE) is larger than the C3 slope (m0), producing a reddened C3 (long dashed line) with a greater y-intercept (nG). If mE < m0, then the unreddened C3 is moved down, producing a reddened C3 (short dashed line) with a lower y-intercept (nL).