Histogram hist = radialDist.getDistribution();
double[][] data = new double[channels][2];
for (int i = 0; i < channels; i++) {
data[i][0] = (hist.minValue(i) + hist.maxValue(i)) / 2.0;
data[i][1] = hist.counts(i);
}
// Save dataset
group.createDataset("data", data);
}