[gmx-users] On g_hbond

[Mr Bernard Ramos]

Hi everyone!
 
On this page

http://manual.gromacs.org/online/g_hbond.html

there is an option -r2 when using g_hbond. What is this r2? I can't find it in the Gromacs manual. option -a is the angle H-O-O, option -r is the O-O distance which can be switched to H-A by using the "-da no". Need help on what is -r2 (could this be for specifying a third criterion for the for distance O-H in addition to the angle cut-off and O-O distance cut-off).

Thanks!
Bernard
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