[galaxy-dev] QUAL file format(s)

Hi all, Is there any documentation on what Galaxy means by the different qual formats? In particular why is there a qual454 and not a qualsanger (to match fastq)? Historically QUAL files were used back in Sanger/capillary sequencing by PHRED, and just hold PHRED scores as integers. This was followed by the Roche 454 output. Peter