 In addition, we ?nd the time-lag between stock market indicator volatility time series and EUA (EU allowances) , WTI (West Texas Intermediate)volatility time series.
<clarity>  In addition, we ?nd the time-lag between stock market indicator volatility time series and EUA (EU allowances) , WTI (West Texas Intermediate)volatility time series.
 In addition, we find a characteristic time lag between the volatility time series and EUA (EU allowances) , WTI (West Texas Intermediate)volatility time series.