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现准备取图中一点进行测量，霜层顶部距离平板的长度，作为霜层厚度并绘制随时间t变化的曲线，请问该如何操作？ QD}YL35CX{MJ~88OJX2UR`E.png （此图为3600s时的霜层分布，不同颜色表示的体积含冰率不一样，取得点为蓝色和白色交界处某一点）
