def phred_13_to_18_sed(self, new_path=None, in_place=True):
        """Illumina-1.3 format conversion to Illumina-1.8 format via sed (faster)."""
        # String #
        sed_command = r"""4~4y/@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghi/!"#$%&'\''()*+,-.\/0123456789:;<=>?@ABCDEFGHIJ/"""
        # Faster with bash utilities #
        if in_place is True:
            sh.sed('-i', sed_command, self.path)
            return self
        # New file #
        if new_path is None: new_fastq = self.__class__(new_temp_path())
        else:                new_fastq = self.__class__(new_path)
        sh.sed(sed_command + " " + new_fastq, self.path)
        return new_fastq