A reviewer may review several thousand sub-images before finding an FMO, just to be disappointed due to bad conditions preventing a recovery the following night.

• 一个查看者可能在发现FMO之前查看过几千张图像,但最终可能因为未来夜晚的差劲条件而使发现的目标丢失，无法得到重新发现，这非常另人失望。