Unusual Options Activity In Index ETF Options From Monday, July 18th

We highlight unusual options activity each night. The third column from the left will highlight such outliers. MDY saw unusual call action on Monday. EFA saw excess put action on Monday.
The rows in the options matrix are as follows:Curr Vlm = Current Option Volume for today
OpVol20 = 20 day Option Volume average
% Delta (sorted descending) = Curr Vlm/ OpVol20 * 100
Sym = Symbol
20 HV 100HV 252HV = 20 day, 100 Day and 252 Day Historical Volatility
Slope = The slope of the historic vol
Delta = Change in slope
cOptInt = Call Open Interest
pOptInt =Put Open Interest
cVolum = Call Volume