Possible error in reported confidence interval used in the DICE paper

In the notebook [notebooks/dice/analysis.ipynb](https://github.com/alshedivat/lola/blob/master/notebooks/dice/analysis.ipynb) which is used to analyse the results and reproduce the fig.5 from the paper [DiCE: The Infinitely Differentiable Monte Carlo Estimator](https://arxiv.org/pdf/1802.05098.pdf), the confidence interval used is 68% instead of the 95% reported in the paper. Also the figure generated by the notebook is the same as the one in the paper when the confidence interval is set to 68% (thus changing this parameter to 95% in the notebook produces a figure with a confidence interval much larger).