The column headings for the "Trees" dataset are:
Diameter (in inches)
Height (in inches)
Volume (in inches³/100)
Diameter Height Volume 8.3 70 10.3 8.6 65 10.3 8.8 63 10.2 10.5 72 16.4 10.7 81 18.8 10.8 83 19.7 11.0 66 15.6 11.0 75 18.2 11.1 80 22.6 11.2 75 19.9 11.3 79 24.2 11.4 76 21.0 11.4 76 21.4 11.7 69 21.3 12.0 75 19.1 12.9 74 22.2 12.9 85 33.8 13.3 86 27.4 13.7 71 25.7 13.8 64 24.9 14.0 78 34.5 14.2 80 31.7 14.5 74 36.3 16.0 72 38.3 16.3 77 42.6 17.3 81 55.4 17.5 82 55.7 17.9 80 58.3 18.0 80 51.5 18.0 80 51.0 20.6 87 77.0