VLBA image of Complex A. The color scale represents the spectral index distribution between 4.3 and 7.6 GHz, overlaid on the contours showing the 4.3 GHz map of the source. Peak intensity is 102 mJy beam⁻¹, the lowest contour level is at 1.35 mJy beam⁻¹ corresponding to 3σ image noise level. The beam size is 4.9 mas × 2.3 mas at a position angle of 10°. The image was created using the VIMAP program (Kim & Trippe 2014).