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We propose the continuation of a very successful fulfill program openParaccepted in AO17 and AO18closePar aimed at studying the flaring phenomenology of the supergiant fast X-ray transients openParSFXTsclosePar. Our milestone analysis of all available XMM SFXT observations proved that the XMM data are the best suited to probe the physics of clumpy wind accretion. The current number of observed flares is still limited and more observations are needed to achieve a meaningful statistical sample for each source. 2-5 flares are observed every 20 ks exposure comma and thus short XMM fulfill observations provide the best mean to build upon the current database comma providing also the required large effective area and good energy resolution to measure of NH and spectral slopes variations within time scales of virgul100 s.