The height of the hill is h=28 mm.

Accurate geometry specification, x ranges from 0. to 54.
=Spline going through the following measured points:
(0.      28.0) ; (9.0     27.0) ; (14.0    24.0) ; (20.0    19.0) ; (30.0    11.0) ; (40.0    4.0) ; (54.0    0.0)
 
 

Between x=0. and x=9.
h(x)=min(28.,
       2.800000000000E+01      +0.000000000000E+00*x
      +6.775070969851E-03*x^2  -2.124527775800E-03*x^3)

Between x=9. and x=14.
h(x)=  2.507355893131E+01      +9.754803562315E-01*x
      -1.016116352781E-01*x^2  +1.889794677828E-03*x^3

Between x=14. and x=20.
h(x)=  2.579601052357E+01      +8.206693007457E-01*x
      -9.055370274339E-02*x^2  +1.626510569859E-03*x^3

Between x=20. and x=30.
h(x)=  4.046435022819E+01      -1.379581654948E+00*x
      +1.945884504128E-02*x^2  -2.070318932190E-04*x^3

Between x=30. and x=40.
h(x)=  1.792461334664E+01      +8.743920332081E-01*x
      -5.567361123058E-02*x^2  +6.277731764683E-04*x^3

Between x=40. and x=54.
h(x)=max(0.,
       5.639011190988E+01      -2.010520359035E+00*x
       +1.644919857549E-02*x^2  +2.674976141766E-05*x^3)

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