... $DATA{$1}{$2}[$set][$replicate] = 0 + "$3.$4"; } elsif ((/^chr(\S+)\s+(\d+)\s+\d+\s+(\d)\s+(\d+)/) && ($1 ~~ @CHROMOSOMES) && ($ +4 >= $MINIMUM_COVERAGE)) { $DATA{$1}{$2}[$set][$replicate] = 0 + $3; ...