yeah I'm seeing that same diagonal... Getting crazy Time to look at the option chains? VIX - 75 months <img src=http://www.ivolatility.com/nchart.j?charts=price,volume&1=ticker*VIX,R*1,period*75,schema*options_big&2=ticker*VIX,R*1,period*75,schema*options_big_narrow&add=x:1> <img src=http://www.ivolatility.com/nchart.j?charts=volatility,options_volume&1=ticker*VIX,R*1,period*75,all*3,schema*options_big&2=ticker*VIX,R*1,period*75,schema*options_big_narrow&add=x:1> <img src=http://www.ivolatility.com/nchart.j?charts=options_volume,volatility&1=ticker*VIX,R*1,period*75,schema*options_big_narrow&2=ticker*VIX,R*1,period*75,all*4,schema*options_big&add=x:1> <a href=http://www.ivolatility.com/help/2.html>Understanding Implied and Historical Volatility</a>