e range as
        the pool size.  If it is set to zero (the default setting)
        then a suitable value is chosen based on
        <TT
CLASS="VARNAME"
>geqo_pool_size</TT
>.
       </P
></DD
><DT
><A
NAME="GUC-GEQO-SELECTION-BIAS"
></A
><TT
CLASS="VARNAME"
>geqo_selection_bias</TT
> (<TT
CLASS="TYPE"
>floating point</TT
>)</DT
><DD
><P
>        Controls the selection bias used by GEQO. The selection bias
        is the selective pressure within the population. Values can be
        from 1.50 to 2.00; th