Top: total intensity contours and polarization vectors of the radio sources in Abell 194. VLA image (left) at 1443 MHz (σ_I = 2 mJy/beam), smoothed with a FWHM Gaussian of 2.9′. SRT image (right) at 6600 MHz (σ_I = 1 mJy/beam), with a resolution of 2.9′. The radio contours are drawn at 3σ_I and the rest are spaced by a factor of 2. The lines give the orientation of the electric vector position angle (E-field) and are proportional in length to the fractional polarization. The vectors are only traced for those pixels where the total intensity signal is above 5σ_I, the error on the polarization angle is less than 10°, and the fractional polarization is above 3σ_FPOL. Middle left: RM image calculated using the images at 1443, 1465, 1515, 1630, and 6600 MHz, smoothed with a FWHM Gaussian of 2.9′. The color range is from −60 to 60 rad/m². Contours refer to the total intensity image at 1443 MHz as in the top left panel. Middle right: histogram of the RM distribution. Bottom: plots of the position angle Ψ as a function of λ² at four different source locations.