8// For each dataset to compare, input the directory path to the Histogram.root file created by `makeValidationPlots`, followed by the dataset label in the comparison plots.
9// The last argument specifies the output directory (including a trailing "/").
10// Example:
11// makeValidationPlotsComparison <path to dataset1 Histograms.root> <dataset1 label> <path to dataset2 Histograms.root> <dataset2 label> <path to output directory>
12//
13// When only two input datasets are provided, the comparisons plots also show a ratio plot.