simply stated , these keys are as follows : the ear is a flap approximately 50 to 60 % as wide as it is high , sitting back one earlength ( 6.5 to 7.5 cm ) from the lateral orbital rim , with the top of the ear level with the brow inclined approximately 20 degrees and protruding 1.5 to 2.0 cm from the head .
C0013443
ear
C0018670
head