The "steam" is just condensation flowing from the air conditioning ducts as the cold air hits the ambient cockpit air on takeoff (full throttle). Cold dry air hitting hot, moist cockpit air...fog...you know.
As for the chart...that's a handy spot. Actually, on a long high flight with the sun beating in, a good chart is a lifesaver...you just build a tent over you to block the sun. After all, who you gonna run into at 70K??