Under winter conditions, the slopes of the fading lines of both sets of standards were more parallel than under summer conditions, and also there was a better correspondence between them. This is attributed to the greater heat-sensitivity of the European standards, more so than to differences in humidity-sensitivity. As in previous exposures, standard 8 showed an abnormal behavior. Standard 7 did not fade over the 164-day period. See also <i>AATA 13-988. -- AATA