(Left) Image of Cyg OB2 obtained by XIS0, XIS1, and XIS3 in the energy range from 0.5 to 10keV. Events due to the calibration sources have been excluded. The identified sources are indicated; A, B, and C are CXO J203308.1 |$+$| 411304.0, J203231.53.1 |$+$| 411408.2, and J203234.33 |$+$| 411506.3, respectively. (Right) Regions of the extracted events. The source and background regions are hatched by meshes and lines, respectively. The details are described in the text.