Take a look at slide 17 of the most recent investor presentation.
According to the slide, PSD typically trades at 4.4 - 4.7 multiple to SFCF/share.
Trailing 12 months SFCF/share at the end of 2012: $0.80
$0.80 * 4.4 multiple = $3.52
$0.80 * 4.7 miltiple = $3.76
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