How can I have the BODE command in the Control System Toolbox plot output in Hertz (Hz) rather than rad/sec?

% Create and LTI system
g = tf([1 0.1 7.5],[1 0.12 9 0 0]);

% Call the BODE function with output arguments
[MAG,PHASE,W] = bode(g);

% Convert the frequency from rad/s to Hz
F = W/(2*pi);

% Convert the magnitude from degrees to decibels 
DMAG = 20 * log10(MAG);

% Create a figure with two plots, the magnitude and phase as a function of
% frequency
subplot(2,1,1);
semilogx(F,reshape(DMAG,size(DMAG,3),1));

subplot(2,1,2);
semilogx(F,reshape(PHASE,size(PHASE,3),1));

ltiview

and then selecting "Toolbox Preferences" from the File pulldown menu. There you can change the default axis settings from Hz to rad/sec and vice versa.