Single bias image from test of CCD

A single bias frame from a themo-electrically cooled CCD camera. Taken as part of a sequence of test images after initially receiving the camer.该数据集包含单幅来自热电冷却CCD（Charge-Coupled Device）相机的偏置帧（bias frame）。该偏置帧是在初次获取该相机后，作为一组测试图像序列的组成部分拍摄所得。