Before revision:  Quite remarkably, when these thresholds were expressed in the color coordinatesdefined before , the change in thresholds followed a simple law that only depended on the  distance between the surround and  the two compared stimuli.
After revision:  Quite remarkably, when these thresholds were expressed in the color coordinatesdefined before , the change in discrimination thresholds induced by the surround followed a simple law that only depended on the distance between the surround and the two compared stimuli.