An upgrade $g_{1} %$ is followed by a downgrade $g_{2} %$ . The equation of the parabolic curve of lenght L to be introduced, is given by

- 1
  
  $g \frac{(g_{1} - g_{2})}{100 L} x^{2}$
- 2
  
  $y = \frac{(g_{1} + g_{2})}{200 L} x^{2}$
- 3
  
  $y = \frac{(g_{1} - g_{2})}{400 L} x^{2}$
- 4
  
  $y = \frac{(g_{2} + g_{1})}{800 L} x^{2}$

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