There's a fairly flat section near the top as the road gets to the valley floor, then rises again to the summit with a hairpin bend. The flat section lowers the average, but it's no more than 7% ish in other stretches. The hill climb tt there is usually won in a 17 minutes and some seconds time.
It's not a doping related book but as an account of the tour from a different perspective than the usual ghost written and glossy journo stuff, Wide Eyed and Legless by Jeff Connor is an entertaining account He was embedded in a tour team (ANC Halfords) long before the term embedded came about...
http://www.newstalk.com/kimmage-talks-froome
I think Newstalk may have a podcast to listen to later, but not sure. He called the Times Pravda amongst other things. Gives them a well worded, well deserved good kicking.
Edit, soundcloud here https://t.co/HGdkFhr7Ed
So very true, mind you I think they really went downhill when Steve Hackett left, the first two after PG's departure weren't too bad, but that was indeed the start of the descent into cr4pness.
You may not be able to access it, but there was a fine documentary on the BBC last week, Genesis...
BBC Sport's coverage of the stage is hardly controversial, not exactly unexpected however. Some hilarious comments though.
http://www.bbc.co.uk/sport/0/cycling/23306438