app/Statistics/Repository/IndividualRepository.php
public function statsBirth(string $color_from = null, string $color_to = null): string
    {
        return (new ChartBirth($this->tree))
            ->chartBirth($color_from, $color_to);
    }
public function statsBirth(string $color_from = null, string $color_to = null): string
    {
        return (new ChartBirth($this->tree))
            ->chartBirth($color_from, $color_to);
    }
public function statsBirth ( string $ color_from = null , string $ color_to = null ) : string { return ( new ChartBirth ( $ this -> tree ) ) -> chartBirth ( $ color_from , $ color_to ) ; }
General query on births.

@param string|null $color_from
@param string|null $color_to

@return string
General query on births .