PI =        0.3141593E+01
E =        0.2718282E+01
IN_PER_CM =        0.3937008E+00
CM_PER_IN =        0.2540000E+01
L_PER_GAL =        0.3785412E+01
GAL_PER_L =        0.2641720E+00
KG_PER_LB =        0.4535924E+00
LB_PER_KG =        0.2204623E+01
KM_PER_PIX = .0285
PIX_PER_KM = 1.0 / KM_PER_PIX