Enter a value for M, the multiplier. LB pruner will find the average of all branch lengths in each newick tree. If any branch is longer than Mx the average, that gene will be written to the output file. If an internal branch is longer than M times the average, then all members of that clade are written to the out file, with 999 as the length of each branch. Third column is branch length, fourth column is average BL for tree.