Mos 1 image and positions of the two components of ρ Ophiuchi system, A and B. The original image is binned in blocks of size 0.2″ × 0.2″, and smoothed with a Gaussian kernel of 3 pixels. The color scale is linear. The cross marks the position of the X-ray centroid and gives a visual estimate of the positional uncertainty. The circles have radii of 1″ to account for the precision of the optical positions. Although we cannot separate X-ray emission of both components, the centroid of the emission appears closer to the A component.