R-band image obtained with the NTT of the knots and the arc, aligned in the horizontal direction parallel to the position of the slit in our spectroscopic observations. The position given by Broos et al. (2007) for the X-ray source CXOU J182100.5-161213, which is a candidate jet-driving source, is shown. CXOU J182100.5-161213 is the only X-ray source detected in the entire field.
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