sys_fp12_cor.dat: total correlated error for Fpi. It is the sum in quadrature of
BCKG**2+TRK**2+MTRK**2+TRG**2+ACC**2+L3**2+FSR**2+VP**2.

sys_spp12_cor.dat: total correlated error for sigma_pp. It is the sum in quadrature of
BCKG**2+TRK**2+MTRK**2+TRG**2+ACC**2+L3**2+FSR**2.

sys_fp12_tot.dat: total error for Fpi. It is the sum in quadrature of the correlated error (sys_fp12_cor.dat), 
the unfolding (sys_unf60.dat) and the 2x2 corr (sys_wei60.dat):
sys_fp12_tot.dat= sqrt(sys_fp12_cor.dat**2+sys_unf60.dat**2+sys_wei60.dat**2)

sys_spp12_tot.dat: total error for sigma_pp. It is the sum in quadrature of the correlated error (sys_spp12_cor.dat), 
the unfolding  (sys_unf60.dat) and the 2x2 corr (sys_wei60.dat):
sys_spp12_tot.dat= sqrt(sys_spp12_cor.dat**2+sys_unf60.dat**2+sys_wei60.dat**2)


These vectors are 60 bins which correspond to M^2_{\pi\pi} and fractional syst errors.