S/N map of the O VIII deabsorbed image. S/N is the RMS value of the deabsorbed O VIII map at 220 < l < 250 deg and fixed b (±5 deg). The longitude range was selected to represent the intensity of the soft X-ray background. In order to enhance the diffuse emission, the map was smoothed with a Gaussian kernel with a full width at half maximum of 1 deg, and bright sources on scales smaller than 1 deg were removed. Coherent patches at S/N ≳ 2 are associated with discrete extended sources, as labeled. The new Goat Horn complex is defined by the coherent S/N ≳ 2 patch within the dashed blue circle.