522 



(•«) I 95 MILLISECONDS BEFORE 

 FIRST MINIMUM 



(6 b) 8S MILLISECONDS BEFORE 

 FIRST MINIMUM 



O 50 MILLISECONDS BEFORE 

 FIRST MINIMUM 



(8 d) AT FIRST MINIMUM 



O a MILLISECONDS AFTER 

 FIRST MIN'MUM 



O eO MILLISECONDS AFTER 

 FIRST MINIMUM 



