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mpilup output quality

Hi All

I was look at the samtools mpileup output format and found something odd in the reported quality scores.

1       633887  G       28      >><<<<CAAA.AA.AAAcaAAAC.A..a    E//E/E6i/EiEEEEEE//AEE//EEEA

In the line above, some calls get a (phred+33 I assume) quality i. As I understand pileup format description (http://samtools.sourceforge.net/pileup.shtml), this should be the mapping quality of the reads at that base. However, when I look at the mapped reads at that position in the .bam file (using samtools view), I find no i quality scores anywhere near those positions.

Hence the question: what quality scores are reported by samtools mpileup?

samtools mpileup phred33 quality scores

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