Two point ratio plot

ROOT
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2

Hello,

Thanks for posting. I think the problem here is a numerical one, not ROOT’s. You are trying to calculate the ratio of floating point numbers in the range of 1e10. I suggest to use numbers nearer to 1, where the density of floating points is at its maximum, e.g.

  double myDataCrossSec = 1.;
  double myDataCrossSecerr = 0.42;

  double myMCCrossSec = 0.9;
  double myMCCrossSecerr = 0.0288;

  
  double slacDataCrossSec = 2;
  double slacDataCrossSecerr = 0.45;

  double slacMCCrossSec = 1.8;
  double slacMCCrossSecerr = 0.036;

And then adapt the cross section units on the y axis accordingly.

I hope this helps.

Cheers,
D

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