params, yfit, xfit = self.wlc_fit(points, displayed_plot.vectors[1][0], displayed_plot.vectors[1][1],pl_value,T)
#save wlc values (nm)
c_lengths.append(params[0]*(1.0e+9))
params, yfit, xfit = self.wlc_fit(points, displayed_plot.vectors[1][0], displayed_plot.vectors[1][1],pl_value,T)
#save wlc values (nm)
c_lengths.append(params[0]*(1.0e+9))