# srad

This keyword specifies the radius of the solvent molecules; this parameter is used to define various solvent-related surfaces and volumes (see srfm (elec)). This value is usually set to 1.4 Å for a water-like molecular surface and set to 0 Å for a van der Waals surface. The syntax is:

    srad {radius}

where `radius` is the floating point value of the solvent radius (in Å). This keyword is ignored for `srfm spl2` (see srfm (elec)).