Plots taken on the real PR2 (press on image to open in new tab):

x-unit: [s] y-unit: [rad/s] joint: l_shoulder_pan_joint

Zoomed in:

Plots taken on the simulated PR2 (press on image to open in new tab):

x-unit: [s] y-unit: [rad/s] joint: l_shoulder_pan_joint

Zoomed in: