Time of emergence offset (minutes from sunset) of Brazilian free-tailed bats (Tadarida brasiliensis) at five maternity colonies in south-central Texas averaged from June 15–July 15.

Means shown with ± standard deviation. Samples sizes of days given below in parentheses. Missing values were due to days obscured by weather or missing radar data for a given date.No emergences were visible on radar at Rucker cave during 2002–2004.本数据集的统计结果以均值±标准差（standard deviation）的形式呈现。各日期对应的样本量标注于下文括号内。缺失值系因当日受天气干扰或对应日期雷达数据缺失所致。2002年至2004年间，拉克尔洞穴（Rucker Cave）的雷达监测未发现任何蝙蝠出巢活动。