public function authset($es) {
        #$t;
        $APA = array();
        $APA[0] = $es * $this->P00;
        $t = $es * $es;
        $APA[0] += $t * $this->P01;
        $APA[1] = $t * $this->P10;
        $t *= $es;
        $APA[0] += $t * $this->P02;
        $APA[1] += $t * $this->P11;
        $APA[2] = $t * $this->P20;

        return $APA;
    }