[gmx-users] question about g_sas

[コウ チ]

hello:
  i used g_sas to plot per resdiue's solvent accessible surface area( the 
input file is confoug.gro and topol.tpr). the output resarea.xvg file is 
like :
....   
#
@    title "Area per residue"
@    xaxis  label "Residue"
@    yaxis  label "Area (nm\S2\N)"
@TYPE xy
         1           0          0
         2   0.0925984     0
         3           0          0
         4   0.0226195 3.13147e-06
.....

 if the second column value indicates the area of residue then what is the 
meaning of the third column value (ie: 3.13147e-06)?
 also i  don't know the algorithm of the programme. does it only caclute 
per residue's solvent accessible area? it seems the result of g_sas tool is 
different with other sas compute programme.
 regards
                                                         caoch
                                                        tokyo institute 
technology