Researchers led by Elena Ruiz tested vertical stripes designed to help birds detect windows. The team measured the percentage of flight-tunnel trials in which birds changed direction before reaching panels with stripes spaced 5, 10, or 15 centimeters apart or panels without stripes. The trials were conducted under both bright and dim light. Because narrower spacing requires more stripes, the researchers recommended 10-centimeter spacing when reducing visual coverage is important, arguing that it preserves most of the effectiveness of 5-centimeter spacing. However, they cautioned against increasing the spacing to 15 centimeters.
Which choice most effectively uses data from the graph to support the researchers’ recommendation?