# return aa * ( x**((gg-2)/2) * np.exp( -gg*x/(2*Tr) ) )
#x,y= np.loadtxt('1L2Y_L_GB000.stat',usecols=(0,10),skiprows=30,unpack=True)
# return aa * ( x**((gg-2)/2) * np.exp( -gg*x/(2*Tr) ) )
#x,y= np.loadtxt('1L2Y_L_GB000.stat',usecols=(0,10),skiprows=30,unpack=True)