src/projCode/Poly.php
function e4fn($x)
    {
        #$con;
        #$com;
        $con = 1.0 + $x;
        $com = 1.0 - $x;
        return (sqrt( (pow( $con, $con )) * (pow( $com, $com )) ));
    }
function e4fn($x)
    {
        #$con;
        #$com;
        $con = 1.0 + $x;
        $com = 1.0 - $x;
        return (sqrt( (pow( $con, $con )) * (pow( $com, $com )) ));
    }
function e4fn ( $ x ) { #$con;
 #$com;
 $ con = 1.0 + $ x ; $ com = 1.0 - $ x ; return ( sqrt ( ( pow ( $ con , $ con ) ) * ( pow ( $ com , $ com ) ) ) ) ; }
Compute the constant e4 from the input of the eccentricity
of the spheroid, x.  This constant is used in the Polar Stereographic
projection.
Compute the constant e4 from the input of the eccentricity of the spheroid x . This constant is used in the Polar Stereographic projection .