Bode 3 dB down point

I need to get the frequency of the 3dB down point from the appearing graphs, however, I am not too sure on how to get it.

clc;
R1 = 9e3;
R2 = 1e3;
C = 0.22e-6;
Z = 1+C*R2;

sys = tf([C*R2 1],[C*R1 Z]);

bode(sys)

Answer 1

[Star Strider]

Use the bandwidth funciton:

fb = bandwidth(sys)

producing:

fb =
          510.290495078091

It does not work al all objects, however it works here.