if (!$this->yscale->IsSpecified() && safe_count($this->plots) > 0) {
            list($min, $max) = $this->GetPlotsYMinMax($this->plots);
            $lres            = $this->GetLinesYMinMax($this->lines);
            if (is_array($lres)) {
                list($linmin, $linmax) = $lres;