Chandra X-ray Observatory Stack acisfJ0554488p072725_001

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采用叠加（即重叠）的钱德拉（Chandra）观测数据以探测X射线源。此举使得该源表能够收录远暗于CSC 1.1的天体源。以该方式组合的重叠观测数据集，被称为"堆叠（stack）"。