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\subsubsection{Forest Fire Danger Index (FFDI) calculation}  Ecuador currently does not have any scientifically designed wildfire potential index. Therefore, an alternative approach was to use an international index suitable for this region. The McArthur Forest Fire Danger Index (FFDI) is an Australian wildfire potential index \cite{Noble1980}. This index uses daily values of maximum temperature, relative humidity and wind speed. The index also incorporates a drought factor. This factor represents moisture changes  in soil. soil moisture.  This is an  indirect measure of the wildfire fuel availability. This empirical index is valid for the Southeastern forest ecosystem of Australia. In this wildfire-prone ecosystem, the eucalyptus is the dominant vegetation. On the other side of the world,  Latin-America —including Ecuador—  experienced a massive introduction of this specie \cite{Anchaluisa2013}.Thus, is reasonable to expect that this index may represent the Ecuadorian wildfire potential. The application of this index with weather station and reanalysis data yielded daily values. With weather station data the calculation comprised the period 1997-2012. The bias-corrected reanalysis data allowed to extend the method for the period 1961-2012. 1963-2012.  For each year, a sum of the daily FFDI values provided a seasonal metric of wildfire potential. This cumulative FFDI corresponds to the wildfire season July-August-September (JAS). Finally, we calculated the 85th percentile on the seasonal FFDI time series. This determined which were extreme wildfire seasons during the period 1961-2012. 1963-2012.  \subsubsection{Investigation of ENSO influence over wildfire seasons}    Two WE used two  approaches drove the investigation of to investigate  ENSO's link over wildfire seasons. Firstly, it was important to know the influence of ENSO in the months leading the wildfire season JAS. Thus, we calculated applied  linear correlations of ENSO indexes  seasonal averagesof ENSO indices  with FFDI values. This These  averages comprised three-months seasons starting from October-November-December (OND) of the previous year. The correlation also  included the SOI and Nino Niño  3.4 values for the concurrent JAS season. A second approach compared the extreme wildfire seasons with ENSO's categories of intensity. We used the categories proposed by the National Oceanic and Atmospheric Administration (NOAA). \section{Results} 
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