errorbar(x,U,dU,dU,dx,dx,'o'), grid on
errorbar(x,U,dU,dU,dx,dx,'o'), grid on
lambda = -((log(U2) - log(U1)) / (27e-3 - 3e-3))^(-1)
lambdaF = -((log(1.2e-3) - log(47.2e-3)) / (27e-3 - 3e-3))^(-1)
lambdaF = (27e-3 - 3e-3) / (log(47.2e-3) - log(1.2e-3))
dLambda = abs(lambda - lambdaF)