Calculation of the relative variance Varr of a binary mixture for a single data point (n = 1). The calculation is based on the following parameters, ɛ1 = 2, ɛ2 = 4, and N1 = N2 = 3. A dashed line is drawn horizontally, so that four cumulants lie below it. The relative variance of the line is 2 × 106, which corresponds to the number of data points required to achieve four statistically significant cumulants.