If the resolution equals 1280x1024 pixels and vertical line frequency is 60Hz, the horizontal line time is 14,6us. This is 11,4ns for the pixel (14,6us / 1280). The electrical current speed in the twisted-pair cable is about 192mlns m/s. If the shift is equal 1 pixel, the shortage of the pair length is 2,19m (192mlns m/s * 11,4ns * 1). In case of 2 pixels it equals 4,38m. The length of the pair of wire has to be increase if the proper RGB channel is shifted (on the right side of tested line). See the picture 3b. The length compensation allows to eliminate this problem. In practice the shifted colors problem doesn't exist below the distance of 50m. The length differences of the pairs can be measured by ohmmeter, too. The shorter length means smaller resistance.