TraPPE-UA ethane (from J. Phys. Chem. B, 102, 2569-2577 (1998)
beta
0.32
   T       RHOG      ERROR      RHOL       ERROR    
   178.0 .21766E-02 .11795E-03 .55108E+00 .87617E-03 49.0 0.2
   197.0 .56274E-02 .51137E-03 .52686E+00 .15355E-02 144.0 11.0
   217.0 .99620E-02 .31008E-03 .49902E+00 .11414E-02 362.0 12.0
   236.0 .19879E-01 .16763E-02 .46898E+00 .17548E-02 774.0 144.0
   256.0 .30961E-01 .44995E-02 .43228E+00 .52414E-02 1118.0 146.0
   275.0 .55561E-01 .79753E-02 .39554E+00 .52225E-02 1916.0 157.0 
   0.00  0.00       0.00       0.00       0.00 0.00 0.00