private function logResample($in, $uhgm)
 {
     $min = min(min($in->xs), $uhgm / 10);
     $max = max(max($in->xs), $uhgm * 10);
     $out = new XY_Series();
     $out->xs = RTGM_Util::buildLogSequence($min, $max, self::UPSAMPLING_FACTOR, true);
     $out->ys = RTGM_Util::findLogLogYArrays($in->xs, $in->ys, $out->xs);
     return $out;
 }