Counter defines time period of observations upon which chart is based (i.e. 1973, Jan). Use buttons [>>] and [<<] to browse forward and backward in time. Use [Step]-menu to choose between monthly, yearly or decadal step during browsing. Use [Scroll] checkbox to (dis)enable autoscrolling. Use [time] checkbox to switch scrolling forward and backward in time. Use buttond [+] and [-] to accelarate or slow down autoscrolling. Use button [2x1] to switch to dual window mode to compare pairs of charts.
Given array is based on processing "Arctic and Southern Ocean Sea Ice Data"(also known as the Walsh data set, J.Walsh) monthly sea ice total concentration patterns for 1973-1990 interval.