Shawn Bowers 2008 tree plot Shawn Bowers public read er-2008-ex2-data.txt 2008 ER Example 2 Data er-2008-ex2-data.txt 1 column , site site Site id Number assigned to sites. plot plot Plot id Number assigned to plot. tmp tmp Air temperature celsius real yr yr Sampling Date YYYY piru piru Diameter at breast height meter real abba abba Diameter at breast height meter real