Two-point spectral index distribution maps of PSO J334 based on: a quasi-simultaneous VLA images at 1.5 and 6.2 GHz, and b 1.7-GHz EVN and 4.38-GHz VLBA images. The lowest contours are at 0.12 and 0.14 mJy beam⁻¹, and contour levels increase by a factor of two. Colors represent spectral index values. We note that the VLBI images were taken half a year apart, so flux density variability cannot be excluded and therefore the spectral index map in panel b should be treated with caution.