g_clustsize creates file 'histo-clust.xvg'. What does y-axis in this file mean? If this is a probability than of what? @ title "Cluster size distribution" @ xaxis label "Cluster size" @ yaxis label "()" @TYPE xy 0 0.000 1 28.385 2 7.135 3 1.552 4 0.447 5 0.120 6 0.034 7 0.009 8 0.003 9 0.001 10 0.000 11 0.000 12 0.000