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     ![]() Doppler effect Moen fig.__vi_1.jpg:462x204, 9k  | 
     ![]() principal ray Moen fig.__vi__3.jpg:462x424, 41k  | 
     ![]() wrong installation Moen fig.__vi__5.jpg:462x226, 11k  | 
     ![]() deviation angle Moen fig._vi__2.jpg:462x272, 19k  | 
     ![]() cosine effect Moen fig__vi__4.jpg:462x266, 13k  |