def coverageInfo(self):
        result = defaultdict(list)
        for titleAlignment in self:
            for hsp in titleAlignment.hsps:
                score = hsp.score.score
                for (subjectOffset, base, _) in titleAlignment.read.walkHSP(
                        hsp, includeWhiskers=False):
                    result[subjectOffset].append((score, base))
        return result