选择peak 区域（选择较为平整部分），如图所示：
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双击 Determine A2, Molar Mass and Radius from LS data
A2: From slope of concentration rms radius: From slope of angular dependence Molar mass: From extrapolation to zero angle and zero
提示:
? 请确认 Plateau method 打钩； dn/dc已正确输入。
? 根据实际情况通过Enabled Detectors 与 Enabled Peaks 删除角度和浓度。 ? 选择 Negative Scale Factor k 可使图形更加清晰。
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