mid: 524
url: http://www.3dcafe.com/models/propane.zip
ref_url: http://www.3dcafe.com/asp/ind_pic.asp
format: xthreexds 
pid: 28756
polygons: 4830
connected_components: 20
average_dihedral_angle: 0.408163
bounding_box: xmin = 0.025, ymin = 0.025, zmin = 0.025, xmax = 0.693611, ymax = 0.975, zmax = 0.69361
avg_depth: 2.331042
center: (0.357710,0.419288,0.359612)
scale: 0.747662
principle_axes: (-0.026061,0.999657,-0.002724), (-0.999041,-0.026141,-0.035127), (-0.035186,0.001806,0.999379)
principle_values: (0.075273,0.033892,0.032984)