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Hi, first of all: we implemented a reasonable I/O mechanism to write and read datasets from root files. VVF now runs on the complete Run1-4 statistics in about 8 (wall clock) minutes on my 1.8 GHz Athlon and requires ~650MB of memory. We also added pull plots to the mES plots, see http://www.slac.stanford.edu/~bozzi/fitr14mES_Aeff.eps Roberto is investigating the possibility to fit mES/sqrt(s), some figures are here: http://www.slac.stanford.edu/~bozzi/mesfitR1.eps (mES/sqrt(s) fit) http://www.slac.stanford.edu/~bozzi/mesfitoldR1-rebin.eps (mES fit) The same fits with 71 bins instead of 40 are at http://www.slac.stanford.edu/~bozzi/mesfitR1-rebin.eps http://www.slac.stanford.edu/~bozzi/mesfitoldR1-rebin.eps We see a dependence of the chisq as a function of the number of bins... to be further investigated. Concezio.