Representative VLBI images of OH 471 across frequencies: This figure displays VLBI images at close epochs from right to left at frequencies of 15.4, 8.7, 2.3, and 1.4 GHz. Image details: 15.4 GHz with beam FWHM of 0.9 mas × 0.7 mas, PA = 6.9°, a peak flux density of 3.04 Jy beam⁻¹m and rms noise of 0.98 mJy beam⁻¹; 8.7 GHz with beam FWHM of 1.0 mas × 0.8 mas, PA = 0.4°, a peak flux density of 2.57 Jy beam⁻¹m and rms noise of 0.72 mJy beam⁻¹; 2.3 GHz with beam FWHM of 4.1 mas × 2.9 mas, PA = 2.4°, a peak flux density of 1.474 Jy beam⁻¹, and rms noise of 0.85 mJy beam⁻¹; and 1.4 GHz with beam FWHM of 10.9 mas × 7.6 mas, PA = 25.6°, a peak flux density of 0.83 Jy beam⁻¹, and rms noise of 0.15 mJy beam⁻¹. The lowest contour is set at three times the rms noise level, with contours increasing in a step of 2.