Fig. 2
From: Unraveling bacterial fingerprints of city subways from microbiome 16S gene profiles
PCA bi-plots of principal components 1, and 2 are presented in a1, b1, and c1 for taxonomic ranks “order”, “family”, and “genus”, respectively. Three-dimensional plots of first three components are presented in a2, b2, and c2 for taxonomic ranks “order”, “family”, and “genus”, respectively. Colors are: orange for Boston, green for New York, and blue for Sacramento