[gmx-users] g_sas and -qmax

[Michael Brunsteiner]

dear all,
I would like to calculate solvent accessible surface areas 
in my system. I find that the g_sas program that comes 
with gromacs has an argument qmax for giving a threshold
above which an atom is to be considered as hydrophilic. 
I wonder if the default value for this number (0.2 e) is
1) an educated guess
2) derived from experimental data, or
3) derived theoretically ?
I'd be also grateful if somebody could point me to 
literature discussing this topic.
cheers,
Michael


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