group dbh
1 0.0104 
1 0.0105 
1 0.0112 
1 0.0116 
1 0.0130 
1 0.0145 
1 0.0154 
1 0.0156 
1 0.0170 
1 0.0180 
1 0.0200 
1 0.0200 
1 0.0210 
1 0.0230 
1 0.0252
2 0.0150 
2 0.0204 
2 0.0208 
2 0.0222 
2 0.0226 
2 0.0245 
2 0.0270 
2 0.0275 
2 0.0306 
2 0.0320