curvature versus slope
  n = 62966 
  X=0, Y = 26.39 +/- 24.52 
  Weighted least-squares fit:  Y = 60.0 + 1.683 X  + -0.01735 X**2 

slope versus dZ, curvature < 5
  n = 5106 
  X=0, Y = 10.21 +/- 7.59 
  Weighted least-squares fit:  Y = 8.4 + 0.759 X  + -0.00061 X**2 
     at X = 100, Y = 78.3 
     effective RMSE xy = 122.2 

slope versus dZ, curvature < 15
  n = 11098 
  X=0, Y = 10.21 +/- 7.59 
  Weighted least-squares fit:  Y = 8.4 + 0.812 X  + -0.00055 X**2 

curvature versus dZ, slope < 10
  n = 3503 
  X=0, Y = 12.05 +/- 7.10 
  Weighted least-squares fit:  Y = 11.3 + 1.799 X  + 0.04370 X**2 


Number of samples 63875
Max dz = 900
Mean dz = 76
RMS dz = 123.975804091
100cm = 74.5643835616 percentile value of dz