Summary of the phantom experiments.

True Value represents optical coefficients measured in infinite medium geometry, and the actual thickness of the first layer; Retrieved Value represents two-layered phantom measurements retrieved using two-layered or homogenous inversion procedures; and Error­ represents the error between the true values and the retrieved values.真值（True Value）为在无限大介质几何构型下测得的光学系数，以及第一层的实际厚度；反演值（Retrieved Value）为采用双层反演或均质反演流程，对双层体模（phantom）测量数据进行反演得到的结果；误差（Error）代表真值与反演值之间的偏差。