Chandra X-ray Observatory Stack acisfJ1224593p125213_002

CSC uses combined (i.e. overlapping) Chandra observations for detecting X-ray sources. This allows the catalog to include significantly fainter sources than CSC 1.1. The set of overlapping observations that have been combined in this way is known as a "stack".CSC利用合并的（即重叠的）钱德拉观测数据来探测X射线源。这使得该目录能够包含比CSC 1.1显著更暗的源。以这种方式合并的重叠观测数据集被称为“stack”。