By joining the points with a smoothed curve, like you did, you are assuming the a functionality between the points that may not have physical meaning. For example why there is a maximum after X=0.01, why is not the maximum y=15 or near X=0.02?.
In general the experimental results are represented by symbols and a model or equation by a curve. If I don't have a model sometimes I join them with straight lines. This implies that I assume a linear change between points.and the caption should say this.