public function deleteGeoAnalysis(GeoAnalysis $ga) {
        Database::prepare(
            'DELETE FROM `##maj_geodispersion`'.
            ' WHERE majgd_file = :gedcom_id AND majgd_id=:ga_id'
            )->execute(array(
                'gedcom_id' => $this->tree->getTreeId(),
                'ga_id' => $ga->getId()
            ));
    }