1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd"> 2<html lang="en"> 3<head> 4<title>aert1.0/13.10.1</title> 5</head> 6<body> 7<pre> 8 % __ __ __ __ __ __ __ __ __ __ __ __ __ __ 9100 | * | 10 90 | * * | 11 80 | * * | 12 70 | @ * | 13 60 | @ * | 14 50 | * @ * | 15 40 | @ * | 16 30 | * @ @ @ * | 17 20 | | 18 10 | @ @ @ @ @ | 19 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 20 Flash frequency (Hertz) 21</pre> 22</body> 23</html> 24