Note that the Phred score is shown as grey histograms behind the electropherogram peaks if one is using '4 Peaks':
Information below borrowed from a sequencing center FAQ here
[Phred - 'Phil's Read Editor' - I've always thought it was cool that it also a homonym of the first name of the inventor of
dideoxy DNA sequencing aka 'Sanger sequencing' - Fred Sanger]