JEB -- Ward et al. 204 (19): 3311 Figure IG6

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Fig. 6. Flight muscle efficiency (E_FM) of two starlings during wind tunnel flight (bird 15, P_mech estimated from the vortex ring model ; bird 15, P_mech estimated from the lifting line model ${circ}$ ; bird 19, P_mech estimated from the lifting line model ${triangleup}$ ), where P_mech is mechanical power.