The coverage over taxa at taxonomic level 8 for asymmetric trees with sequences sampled by AST, RS and SS using bias index = 0.1.

aAST: automated sampling homologs over taxa.bSS: sampling homologs most similar to the query by a custom script.cRS: random sampling by a custom script.dAll-seq: all the 1024 homologous sequences without sampling.The first column m represents the number of sampled sequences and the remaining value represents the mean±std of the number of covered taxa by each method when sampling m sequences. The last column indicates the average along with standard deviations of the number of taxa covered by the number of all homolgous sequences for 100 asymmetric trees.