Shawn Bowers 2008 tree Shawn Bowers public read er-2008-ex1-data.txt 2008 ER Example 1 Data er-2008-ex1-data.txt 1 column , https://code.ecoinformatics.org/code/semtools/trunk/dev/sms/examples/er-2008-ex1-data.txt tree tree Tree id Number assigned to trees. spp spp Species name. piru Picea rubens abba Abies balsamea yr yr Sampling Date YYYY dbh dbh Diameter at breast height meter real