Origin中在同一坐标轴拟合多条直线的方法
第一步：输入数据
第二步：选中所有数据
第三步：选中下面的散点图
第四步：选中所有散点
第五步：选择Analysis-Fitting- Fitt linear-last user
第六步：最小化后
第七步：去掉不需要的部分，导出图片
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